This page lists all security vulnerabilities fixed in released versions of Apache httpd 2.0. Each vulnerability is given a security impact rating by the Apache security team - please note that this rating may well vary from platform to platform. We also list the versions of Apache httpd the flaw is known to affect, and where a flaw has not been verified list the version with a question mark.

Please note that if a vulnerability is shown below as being fixed in a "-dev" release then this means that a fix has been applied to the development source tree and will be part of an upcoming full release.

This page is created from a database of vulnerabilities originally populated by Apache Week. Please send comments or corrections for these vulnerabilities to the Security Team.

important: mod_isapi module unload flaw CVE-2010-0425

A flaw was found with within mod_isapi which would attempt to unload the ISAPI dll when it encountered various error states. This could leave the callbacks in an undefined state and result in a segfault. On Windows platforms using mod_isapi, a remote attacker could send a malicious request to trigger this issue, and as win32 MPM runs only one process, this would result in a denial of service, and potentially allow arbitrary code execution.

Acknowledgements: We would like to thank Brett Gervasoni of Sense of Security for reporting and proposing a patch fix for this issue.

Affects: 2.0.63, 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37

low: mod_proxy_ftp FTP command injection CVE-2009-3095

A flaw was found in the mod_proxy_ftp module. In a reverse proxy configuration, a remote attacker could use this flaw to bypass intended access restrictions by creating a carefully-crafted HTTP Authorization header, allowing the attacker to send arbitrary commands to the FTP server.

Affects: 2.0.63, 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: mod_proxy_ftp DoS CVE-2009-3094

A NULL pointer dereference flaw was found in the mod_proxy_ftp module. A malicious FTP server to which requests are being proxied could use this flaw to crash an httpd child process via a malformed reply to the EPSV or PASV commands, resulting in a limited denial of service.

Affects: 2.0.63, 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: Subrequest handling of request headers (mod_headers) CVE-2010-0434

A flaw in the core subrequest process code was fixed, to always provide a shallow copy of the headers_in array to the subrequest, instead of a pointer to the parent request's array as it had for requests without request bodies. This meant all modules such as mod_headers which may manipulate the input headers for a subrequest would poison the parent request in two ways, one by modifying the parent request, which might not be intended, and second by leaving pointers to modified header fields in memory allocated to the subrequest scope, which could be freed before the main request processing was finished, resulting in a segfault or in revealing data from another request on threaded servers, such as the worker or winnt MPMs.

Acknowledgements: We would like to thank Philip Pickett of VMware for reporting and proposing a fix for this issue.

Affects: 2.0.63, 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: mod_proxy_ftp globbing XSS CVE-2008-2939

A flaw was found in the handling of wildcards in the path of a FTP URL with mod_proxy_ftp. If mod_proxy_ftp is enabled to support FTP-over-HTTP, requests containing globbing characters could lead to cross-site scripting (XSS) attacks.

Affects: 2.0.63, 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: mod_proxy_http DoS CVE-2008-2364

A flaw was found in the handling of excessive interim responses from an origin server when using mod_proxy_http. A remote attacker could cause a denial of service or high memory usage.

Affects: 2.0.63, 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: mod_proxy_ftp UTF-7 XSS CVE-2008-0005

A workaround was added in the mod_proxy_ftp module. On sites where mod_proxy_ftp is enabled and a forward proxy is configured, a cross-site scripting attack is possible against Web browsers which do not correctly derive the response character set following the rules in RFC 2616.

Update Released: 19th January 2008

Affects: 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: mod_status XSS CVE-2007-6388

A flaw was found in the mod_status module. On sites where mod_status is enabled and the status pages were publicly accessible, a cross-site scripting attack is possible. Note that the server-status page is not enabled by default and it is best practice to not make this publicly available.

Update Released: 19th January 2008

Affects: 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: mod_imap XSS CVE-2007-5000

A flaw was found in the mod_imap module. On sites where mod_imap is enabled and an imagemap file is publicly available, a cross-site scripting attack is possible.

Update Released: 19th January 2008

Affects: 2.0.61, 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: mod_proxy crash CVE-2007-3847

A flaw was found in the Apache HTTP Server mod_proxy module. On sites where a reverse proxy is configured, a remote attacker could send a carefully crafted request that would cause the Apache child process handling that request to crash. On sites where a forward proxy is configured, an attacker could cause a similar crash if a user could be persuaded to visit a malicious site using the proxy. This could lead to a denial of service if using a threaded Multi-Processing Module.

Update Released: 7th September 2007

Affects: 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: mod_status cross-site scripting CVE-2006-5752

A flaw was found in the mod_status module. On sites where the server-status page is publicly accessible and ExtendedStatus is enabled this could lead to a cross-site scripting attack. Note that the server-status page is not enabled by default and it is best practice to not make this publicly available.

Update Released: 7th September 2007

Affects: 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: Signals to arbitrary processes CVE-2007-3304

The Apache HTTP server did not verify that a process was an Apache child process before sending it signals. A local attacker with the ability to run scripts on the HTTP server could manipulate the scoreboard and cause arbitrary processes to be terminated which could lead to a denial of service.

Update Released: 7th September 2007

Affects: 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: mod_cache proxy DoS CVE-2007-1863

A bug was found in the mod_cache module. On sites where caching is enabled, a remote attacker could send a carefully crafted request that would cause the Apache child process handling that request to crash. This could lead to a denial of service if using a threaded Multi-Processing Module.

Update Released: 7th September 2007

Affects: 2.0.59, 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37

important: mod_rewrite off-by-one error CVE-2006-3747

An off-by-one flaw exists in the Rewrite module, mod_rewrite. Depending on the manner in which Apache httpd was compiled, this software defect may result in a vulnerability which, in combination with certain types of Rewrite rules in the web server configuration files, could be triggered remotely. For vulnerable builds, the nature of the vulnerability can be denial of service (crashing of web server processes) or potentially allow arbitrary code execution.

Update Released: 27th July 2006

Affects: 2.0.58, 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46

low: mod_ssl access control DoS CVE-2005-3357

A NULL pointer dereference flaw in mod_ssl was discovered affecting server configurations where an SSL virtual host is configured with access control and a custom 400 error document. A remote attacker could send a carefully crafted request to trigger this issue which would lead to a crash. This crash would only be a denial of service if using the worker MPM.

Update Released: 1st May 2006

Affects: 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: mod_imap Referer Cross-Site Scripting CVE-2005-3352

A flaw in mod_imap when using the Referer directive with image maps. In certain site configurations a remote attacker could perform a cross-site scripting attack if a victim can be forced to visit a malicious URL using certain web browsers.

Update Released: 1st May 2006

Affects: 2.0.55, 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: SSLVerifyClient bypass CVE-2005-2700

A flaw in the mod_ssl handling of the "SSLVerifyClient" directive. This flaw would occur if a virtual host has been configured using "SSLVerifyClient optional" and further a directive "SSLVerifyClient required" is set for a specific location. For servers configured in this fashion, an attacker may be able to access resources that should otherwise be protected, by not supplying a client certificate when connecting.

Update Released: 14th October 2005

Affects: 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: Worker MPM memory leak CVE-2005-2970

A memory leak in the worker MPM would allow remote attackers to cause a denial of service (memory consumption) via aborted connections, which prevents the memory for the transaction pool from being reused for other connections. This issue was downgraded in severity to low (from moderate) as sucessful exploitation of the race condition would be difficult.

Update Released: 14th October 2005

Affects: 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36

low: PCRE overflow CVE-2005-2491

An integer overflow flaw was found in PCRE, a Perl-compatible regular expression library included within httpd. A local user who has the ability to create .htaccess files could create a maliciously crafted regular expression in such as way that they could gain the privileges of a httpd child.

Update Released: 14th October 2005

Affects: 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: Malicious CRL off-by-one CVE-2005-1268

An off-by-one stack overflow was discovered in the mod_ssl CRL verification callback. In order to exploit this issue the Apache server would need to be configured to use a malicious certificate revocation list (CRL)

Update Released: 14th October 2005

Affects: 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: Byterange filter DoS CVE-2005-2728

A flaw in the byterange filter would cause some responses to be buffered into memory. If a server has a dynamic resource such as a CGI script or PHP script which generates a large amount of data, an attacker could send carefully crafted requests in order to consume resources, potentially leading to a Denial of Service.

Update Released: 14th October 2005

Affects: 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: HTTP Request Spoofing CVE-2005-2088

A flaw occured when using the Apache server as a HTTP proxy. A remote attacker could send a HTTP request with both a "Transfer-Encoding: chunked" header and a Content-Length header, causing Apache to incorrectly handle and forward the body of the request in a way that causes the receiving server to process it as a separate HTTP request. This could allow the bypass of web application firewall protection or lead to cross-site scripting (XSS) attacks.

Update Released: 14th October 2005

Affects: 2.0.54, 2.0.53, 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: Memory consumption DoS CVE-2004-0942

An issue was discovered where the field length limit was not enforced for certain malicious requests. This could allow a remote attacker who is able to send large amounts of data to a server the ability to cause Apache children to consume proportional amounts of memory, leading to a denial of service.

Update Released: 8th February 2005

Affects: 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: mod_disk_cache stores sensitive headers CVE-2004-1834

The experimental mod_disk_cache module stored client authentication credentials for cached objects such as proxy authentication credentials and Basic Authentication passwords on disk.

Update Released: 8th February 2005

Affects: 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: SSLCipherSuite bypass CVE-2004-0885

An issue has been discovered in the mod_ssl module when configured to use the "SSLCipherSuite" directive in directory or location context. If a particular location context has been configured to require a specific set of cipher suites, then a client will be able to access that location using any cipher suite allowed by the virtual host configuration.

Update Released: 8th February 2005

Affects: 2.0.52, 2.0.51, 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: Basic authentication bypass CVE-2004-0811

A flaw in Apache 2.0.51 (only) broke the merging of the Satisfy directive which could result in access being granted to resources despite any configured authentication

Update Released: 28th September 2004

Affects: 2.0.51

critical: IPv6 URI parsing heap overflow CVE-2004-0786

Testing using the Codenomicon HTTP Test Tool performed by the Apache Software Foundation security group and Red Hat uncovered an input validation issue in the IPv6 URI parsing routines in the apr-util library. If a remote attacker sent a request including a carefully crafted URI, an httpd child process could be made to crash. One some BSD systems it is believed this flaw may be able to lead to remote code execution.

Update Released: 15th September 2004

Affects: 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: SSL connection infinite loop CVE-2004-0748

An issue was discovered in the mod_ssl module in Apache 2.0. A remote attacker who forces an SSL connection to be aborted in a particular state may cause an Apache child process to enter an infinite loop, consuming CPU resources.

Update Released: 15th September 2004

Affects: 2.0.50, 2.0.49?, 2.0.48?, 2.0.47?, 2.0.46?, 2.0.45?, 2.0.44?, 2.0.43?, 2.0.42?, 2.0.40?, 2.0.39?, 2.0.37?, 2.0.36?, 2.0.35?

low: Environment variable expansion flaw CVE-2004-0747

A buffer overflow was found in the expansion of environment variables during configuration file parsing. This issue could allow a local user to gain the privileges of a httpd child if a server can be forced to parse a carefully crafted .htaccess file written by a local user.

Acknowledgements: We would like to thank the Swedish IT Incident Centre (SITIC) for reporting this issue.

Update Released: 15th September 2004

Affects: 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: Malicious SSL proxy can cause crash CVE-2004-0751

An issue was discovered in the mod_ssl module in Apache 2.0.44-2.0.50 which could be triggered if the server is configured to allow proxying to a remote SSL server. A malicious remote SSL server could force an httpd child process to crash by sending a carefully crafted response header. This issue is not believed to allow execution of arbitrary code and will only result in a denial of service where a threaded process model is in use.

Update Released: 15th September 2004

Affects: 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44

low: WebDAV remote crash CVE-2004-0809

An issue was discovered in the mod_dav module which could be triggered for a location where WebDAV authoring access has been configured. A malicious remote client which is authorized to use the LOCK method could force an httpd child process to crash by sending a particular sequence of LOCK requests. This issue does not allow execution of arbitrary code. and will only result in a denial of service where a threaded process model is in use.

Update Released: 15th September 2004

Affects: 2.0.50, 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: Header parsing memory leak CVE-2004-0493

A memory leak in parsing of HTTP headers which can be triggered remotely may allow a denial of service attack due to excessive memory consumption.

Update Released: 1st July 2004

Affects: 2.0.49, 2.0.48?, 2.0.47?, 2.0.46?, 2.0.45?, 2.0.44?, 2.0.43?, 2.0.42?, 2.0.40?, 2.0.39?, 2.0.37?, 2.0.36?, 2.0.35?

low: FakeBasicAuth overflow CVE-2004-0488

A buffer overflow in the mod_ssl FakeBasicAuth code could be exploited by an attacker using a (trusted) client certificate with a subject DN field which exceeds 6K in length.

Update Released: 1st July 2004

Affects: 2.0.49, 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: listening socket starvation CVE-2004-0174

A starvation issue on listening sockets occurs when a short-lived connection on a rarely-accessed listening socket will cause a child to hold the accept mutex and block out new connections until another connection arrives on that rarely-accessed listening socket. This issue is known to affect some versions of AIX, Solaris, and Tru64; it is known to not affect FreeBSD or Linux.

Update Released: 19th March 2004

Affects: 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: mod_ssl memory leak CVE-2004-0113

A memory leak in mod_ssl allows a remote denial of service attack against an SSL-enabled server by sending plain HTTP requests to the SSL port.

Update Released: 19th March 2004

Affects: 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: Error log escape filtering CVE-2003-0020

Apache does not filter terminal escape sequences from error logs, which could make it easier for attackers to insert those sequences into terminal emulators containing vulnerabilities related to escape sequences.

Update Released: 19th March 2004

Affects: 2.0.48, 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: Local configuration regular expression overflow CVE-2003-0542

By using a regular expression with more than 9 captures a buffer overflow can occur in mod_alias or mod_rewrite. To exploit this an attacker would need to be able to create a carefully crafted configuration file (.htaccess or httpd.conf)

Update Released: 27th October 2003

Affects: 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: CGI output information leak CVE-2003-0789

A bug in mod_cgid mishandling of CGI redirect paths can result in CGI output going to the wrong client when a threaded MPM is used.

Update Released: 27th October 2003

Affects: 2.0.47, 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: Remote DoS with multiple Listen directives CVE-2003-0253

In a server with multiple listening sockets a certain error returned by accept() on a rarely access port can cause a temporary denial of service, due to a bug in the prefork MPM.

Update Released: 9th July 2003

Affects: 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: mod_ssl renegotiation issue CVE-2003-0192

A bug in the optional renegotiation code in mod_ssl included with Apache httpd can cause cipher suite restrictions to be ignored. This is triggered if optional renegotiation is used (SSLOptions +OptRenegotiate) along with verification of client certificates and a change to the cipher suite over the renegotiation.

Update Released: 9th July 2003

Affects: 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: Remote DoS via IPv6 ftp proxy CVE-2003-0254

When a client requests that proxy ftp connect to a ftp server with IPv6 address, and the proxy is unable to create an IPv6 socket, an infinite loop occurs causing a remote Denial of Service.

Update Released: 9th July 2003

Affects: 2.0.46, 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

critical: APR remote crash CVE-2003-0245

A vulnerability in the apr_psprintf function in the Apache Portable Runtime (APR) library allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via long strings, as demonstrated using XML objects to mod_dav, and possibly other vectors.

Update Released: 28th May 2003

Affects: 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37

important: Basic Authentication DoS CVE-2003-0189

A build system problem in Apache 2.0.40 through 2.0.45 allows remote attackers to cause a denial of access to authenticated content when a threaded server is used.

Update Released: 28th May 2003

Affects: 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40

important: OS2 device name DoS CVE-2003-0134

Apache on OS2 up to and including Apache 2.0.45 have a Denial of Service vulnerability caused by device names.

Update Released: 28th May 2003

Affects: 2.0.45, 2.0.44?, 2.0.43?, 2.0.42?, 2.0.40?, 2.0.39?, 2.0.37?, 2.0.36?, 2.0.35?

low: Filtered escape sequences CVE-2003-0083

Apache did not filter terminal escape sequences from its access logs, which could make it easier for attackers to insert those sequences into terminal emulators containing vulnerabilities related to escape sequences.

Update Released: 2nd April 2004

Affects: 2.0.45, 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: Line feed memory leak DoS CVE-2003-0132

Apache 2.0 versions before Apache 2.0.45 had a significant Denial of Service vulnerability. Remote attackers could cause a denial of service (memory consumption) via large chunks of linefeed characters, which causes Apache to allocate 80 bytes for each linefeed.

Update Released: 2nd April 2004

Affects: 2.0.44, 2.0.43, 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

critical: MS-DOS device name filtering CVE-2003-0016

On Windows platforms Apache did not correctly filter MS-DOS device names which could lead to denial of service attacks or remote code execution.

Update Released: 20th January 2003

Affects: 2.0.43, 2.0.42?, 2.0.40?, 2.0.39?, 2.0.37?, 2.0.36?, 2.0.35?

important: Apache can serve unexpected files CVE-2003-0017

On Windows platforms Apache could be forced to serve unexpected files by appending illegal characters such as '<' to the request URL

Update Released: 20th January 2003

Affects: 2.0.43, 2.0.42?, 2.0.40?, 2.0.39?, 2.0.37?, 2.0.36?, 2.0.35?

low: Error page XSS using wildcard DNS CVE-2002-0840

Cross-site scripting (XSS) vulnerability in the default error page of Apache 2.0 before 2.0.43, and 1.3.x up to 1.3.26, when UseCanonicalName is "Off" and support for wildcard DNS is present, allows remote attackers to execute script as other web page visitors via the Host: header.

Update Released: 3rd October 2002

Affects: 2.0.42, 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

moderate: CGI scripts source revealed using WebDAV CVE-2002-1156

In Apache 2.0.42 only, for a location where both WebDAV and CGI were enabled, a POST request to a CGI script would reveal the CGI source to a remote user.

Update Released: 3rd October 2002

Affects: 2.0.42

moderate: mod_dav crash CVE-2002-1593

A flaw was found in handling of versioning hooks in mod_dav. An attacker could send a carefully crafted request in such a way to cause the child process handling the connection to crash. This issue will only result in a denial of service where a threaded process model is in use.

Update Released: 24th September 2002

Affects: 2.0.40, 2.0.39, 2.0.37, 2.0.36, 2.0.35

important: Path vulnerability CVE-2002-0661

Certain URIs would bypass security and allow users to invoke or access any file depending on the system configuration. Affects Windows, OS2, Netware and Cygwin platforms only.

Update Released: 9th August 2002

Affects: 2.0.39, 2.0.37, 2.0.36, 2.0.35

low: Path revealing exposures CVE-2002-0654

A path-revealing exposure was present in multiview type map negotiation (such as the default error documents) where a module would report the full path of the typemapped .var file when multiple documents or no documents could be served. Additionally a path-revealing exposure in cgi/cgid when Apache fails to invoke a script. The modules would report "couldn't create child process /path-to-script/script.pl" revealing the full path of the script.

Update Released: 9th August 2002

Affects: 2.0.39, 2.0.37?, 2.0.36?, 2.0.35?

critical: Apache Chunked encoding vulnerability CVE-2002-0392

Malicious requests can cause various effects ranging from a relatively harmless increase in system resources through to denial of service attacks and in some cases the ability to execute arbitrary remote code.

Update Released: 18th June 2002

Affects: 2.0.36, 2.0.35

low: Warning messages could be displayed to users CVE-2002-1592

In some cases warning messages could get returned to end users in addition to being recorded in the error log. This could reveal the path to a CGI script for example, a minor security exposure.

Update Released: 8th May 2002

Affects: 2.0.35

This page lists all security vulnerabilities fixed in released versions of Apache httpd 1.3. Each vulnerability is given a security impact rating by the Apache security team - please note that this rating may well vary from platform to platform. We also list the versions of Apache httpd the flaw is known to affect, and where a flaw has not been verified list the version with a question mark.

Please note that if a vulnerability is shown below as being fixed in a "-dev" release then this means that a fix has been applied to the development source tree and will be part of an upcoming full release.

This page is created from a database of vulnerabilities originally populated by Apache Week. Please send comments or corrections for these vulnerabilities to the Security Team.

moderate: mod_proxy overflow on 64-bit systems CVE-2010-0010

An incorrect conversion between numeric types flaw was found in the mod_proxy module which affects some 64-bit architecture systems. A malicious HTTP server to which requests are being proxied could use this flaw to trigger a heap buffer overflow in an httpd child process via a carefully crafted response.

Update Released: 3rd February 2010

Affects: 1.3.41, 1.3.39, 1.3.37, 1.3.36, 1.3.35, 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2

moderate: mod_status XSS CVE-2007-6388

A flaw was found in the mod_status module. On sites where mod_status is enabled and the status pages were publicly accessible, a cross-site scripting attack is possible. Note that the server-status page is not enabled by default and it is best practice to not make this publicly available.

Update Released: 19th January 2008

Affects: 1.3.39, 1.3.37, 1.3.36, 1.3.35, 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2

moderate: mod_imap XSS CVE-2007-5000

A flaw was found in the mod_imap module. On sites where mod_imap is enabled and an imagemap file is publicly available, a cross-site scripting attack is possible.

Update Released: 19th January 2008

Affects: 1.3.39, 1.3.37, 1.3.36, 1.3.35, 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

moderate: mod_status cross-site scripting CVE-2006-5752

A flaw was found in the mod_status module. On sites where the server-status page is publicly accessible and ExtendedStatus is enabled this could lead to a cross-site scripting attack. Note that the server-status page is not enabled by default and it is best practice to not make this publicly available.

Update Released: 7th September 2007

Affects: 1.3.37, 1.3.36, 1.3.35, 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2

moderate: Signals to arbitrary processes CVE-2007-3304

The Apache HTTP server did not verify that a process was an Apache child process before sending it signals. A local attacker with the ability to run scripts on the HTTP server could manipulate the scoreboard and cause arbitrary processes to be terminated which could lead to a denial of service.

Update Released: 7th September 2007

Affects: 1.3.37, 1.3.36, 1.3.35, 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

important: mod_rewrite off-by-one error CVE-2006-3747

An off-by-one flaw exists in the Rewrite module, mod_rewrite. Depending on the manner in which Apache httpd was compiled, this software defect may result in a vulnerability which, in combination with certain types of Rewrite rules in the web server configuration files, could be triggered remotely. For vulnerable builds, the nature of the vulnerability can be denial of service (crashing of web server processes) or potentially allow arbitrary code execution.

Update Released: 27th July 2006

Affects: 1.3.36, 1.3.35, 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28

moderate: Expect header Cross-Site Scripting CVE-2006-3918

A flaw in the handling of invalid Expect headers. If an attacker can influence the Expect header that a victim sends to a target site they could perform a cross-site scripting attack. It is known that some versions of Flash can set an arbitrary Expect header which can trigger this flaw. Not marked as a security issue for 2.0 or 2.2 as the cross-site scripting is only returned to the victim after the server times out a connection.

Update Released: 1st May 2006

Affects: 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3

moderate: mod_imap Referer Cross-Site Scripting CVE-2005-3352

A flaw in mod_imap when using the Referer directive with image maps. In certain site configurations a remote attacker could perform a cross-site scripting attack if a victim can be forced to visit a malicious URL using certain web browsers.

Update Released: 1st May 2006

Affects: 1.3.34, 1.3.33, 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

moderate: mod_include overflow CVE-2004-0940

A buffer overflow in mod_include could allow a local user who is authorised to create server side include (SSI) files to gain the privileges of a httpd child.

Update Released: 28th October 2004

Affects: 1.3.32, 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

moderate: mod_proxy buffer overflow CVE-2004-0492

A buffer overflow was found in the Apache proxy module, mod_proxy, which can be triggered by receiving an invalid Content-Length header. In order to exploit this issue an attacker would need to get an Apache installation that was configured as a proxy to connect to a malicious site. This would cause the Apache child processing the request to crash, although this does not represent a significant Denial of Service attack as requests will continue to be handled by other Apache child processes. This issue may lead to remote arbitrary code execution on some BSD platforms.

Update Released: 20th October 2004

Affects: 1.3.31, 1.3.29, 1.3.28, 1.3.27, 1.3.26

important: listening socket starvation CVE-2004-0174

A starvation issue on listening sockets occurs when a short-lived connection on a rarely-accessed listening socket will cause a child to hold the accept mutex and block out new connections until another connection arrives on that rarely-accessed listening socket. This issue is known to affect some versions of AIX, Solaris, and Tru64; it is known to not affect FreeBSD or Linux.

Update Released: 12th May 2004

Affects: 1.3.29, 1.3.28?, 1.3.27?, 1.3.26?, 1.3.24?, 1.3.22?, 1.3.20?, 1.3.19?, 1.3.17?, 1.3.14?, 1.3.12?, 1.3.11?, 1.3.9?, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

important: Allow/Deny parsing on big-endian 64-bit platforms CVE-2003-0993

A bug in the parsing of Allow/Deny rules using IP addresses without a netmask on big-endian 64-bit platforms causes the rules to fail to match.

Update Released: 12th May 2004

Affects: 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

low: Error log escape filtering CVE-2003-0020

Apache does not filter terminal escape sequences from error logs, which could make it easier for attackers to insert those sequences into terminal emulators containing vulnerabilities related to escape sequences.

Update Released: 12th May 2004

Affects: 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

low: mod_digest nonce checking CVE-2003-0987

mod_digest does not properly verify the nonce of a client response by using a AuthNonce secret. This could allow a malicious user who is able to sniff network traffic to conduct a replay attack against a website using Digest protection. Note that mod_digest implements an older version of the MD5 Digest Authentication specification which is known not to work with modern browsers. This issue does not affect mod_auth_digest.

Update Released: 12th May 2004

Affects: 1.3.29, 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

low: Local configuration regular expression overflow CVE-2003-0542

By using a regular expression with more than 9 captures a buffer overflow can occur in mod_alias or mod_rewrite. To exploit this an attacker would need to be able to create a carefully crafted configuration file (.htaccess or httpd.conf)

Update Released: 27th October 2003

Affects: 1.3.28, 1.3.27, 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

important: RotateLogs DoS CVE-2003-0460

The rotatelogs support program on Win32 and OS/2 would quit logging and exit if it received special control characters such as 0x1A.

Update Released: 18th July 2003

Affects: 1.3.27, 1.3.26?, 1.3.24?, 1.3.22?, 1.3.20?, 1.3.19?, 1.3.17?, 1.3.14?, 1.3.12?, 1.3.11?, 1.3.9?, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

important: Buffer overflows in ab utility CVE-2002-0843

Buffer overflows in the benchmarking utility ab could be exploited if ab is run against a malicious server

Update Released: 3rd October 2002

Affects: 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

important: Shared memory permissions lead to local privilege escalation CVE-2002-0839

The permissions of the shared memory used for the scoreboard allows an attacker who can execute under the Apache UID to send a signal to any process as root or cause a local denial of service attack.

Update Released: 3rd October 2002

Affects: 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

low: Error page XSS using wildcard DNS CVE-2002-0840

Cross-site scripting (XSS) vulnerability in the default error page of Apache 2.0 before 2.0.43, and 1.3.x up to 1.3.26, when UseCanonicalName is "Off" and support for wildcard DNS is present, allows remote attackers to execute script as other web page visitors via the Host: header.

Update Released: 3rd October 2002

Affects: 1.3.26, 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

critical: Apache Chunked encoding vulnerability CVE-2002-0392

Requests to all versions of Apache 1.3 can cause various effects ranging from a relatively harmless increase in system resources through to denial of service attacks and in some cases the ability to be remotely exploited.

Update Released: 18th June 2002

Affects: 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

low: Filtered escape sequences CVE-2003-0083

Apache does not filter terminal escape sequences from its access logs, which could make it easier for attackers to insert those sequences into terminal emulators containing vulnerabilities related to escape sequences,

Update Released: 18th June 2002

Affects: 1.3.24, 1.3.22, 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

critical: Win32 Apache Remote command execution CVE-2002-0061

Apache for Win32 before 1.3.24 and 2.0.34-beta allows remote attackers to execute arbitrary commands via parameters passed to batch file CGI scripts.

Update Released: 22nd March 2002

Affects: 1.3.22, 1.3.20?, 1.3.19?, 1.3.17?, 1.3.14?, 1.3.12?, 1.3.11?, 1.3.9?, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

important: Requests can cause directory listing to be displayed CVE-2001-0729

A vulnerability was found in the Win32 port of Apache 1.3.20. A client submitting a very long URI could cause a directory listing to be returned rather than the default index page.

Update Released: 12th October 2001

Affects: 1.3.20

important: Multiviews can cause a directory listing to be displayed CVE-2001-0731

A vulnerability was found when Multiviews are used to negotiate the directory index. In some configurations, requesting a URI with a QUERY_STRING of M=D could return a directory listing rather than the expected index page.

Update Released: 12th October 2001

Affects: 1.3.20, 1.3.19?, 1.3.17?, 1.3.14?, 1.3.12?, 1.3.11?, 1.3.9?, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

moderate: split-logfile can cause arbitrary log files to be written to CVE-2001-0730

A vulnerability was found in the split-logfile support program. A request with a specially crafted Host: header could allow any file with a .log extension on the system to be written to.

Update Released: 12th October 2001

Affects: 1.3.20, 1.3.19, 1.3.17, 1.3.14, 1.3.12, 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

important: Denial of service attack on Win32 and OS2 CVE-2001-1342

A vulnerability was found in the Win32 and OS2 ports of Apache 1.3. A client submitting a carefully constructed URI could cause a General Protection Fault in a child process, bringing up a message box which would have to be cleared by the operator to resume operation. This vulnerability introduced no identified means to compromise the server other than introducing a possible denial of service.

Update Released: 22nd May 2001

Affects: 1.3.20, 1.3.19?, 1.3.17?, 1.3.14?, 1.3.12?, 1.3.11?, 1.3.9?, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

important: Requests can cause directory listing to be displayed CVE-2001-0925

The default installation can lead mod_negotiation and mod_dir or mod_autoindex to display a directory listing instead of the multiview index.html file if a very long path was created artificially by using many slashes.

Update Released: 28th February 2001

Affects: 1.3.17, 1.3.14, 1.3.12, 1.3.11

important: Rewrite rules that include references allow access to any file CVE-2000-0913

The Rewrite module, mod_rewrite, can allow access to any file on the web server. The vulnerability occurs only with certain specific cases of using regular expression references in RewriteRule directives: If the destination of a RewriteRule contains regular expression references then an attacker will be able to access any file on the server.

Update Released: 13th October 2000

Affects: 1.3.12, 1.3.11?, 1.3.9?, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

important: Mass virtual hosting can display CGI source CVE-2000-1204

A security problem for users of the mass virtual hosting module, mod_vhost_alias, causes the source to a CGI to be sent if the cgi-bin directory is under the document root. However, it is not normal to have your cgi-bin directory under a document root.

Update Released: 13th October 2000

Affects: 1.3.12, 1.3.11, 1.3.9

moderate: Requests can cause directory listing to be displayed on NT CVE-2000-0505

A security hole on Apache for Windows allows a user to view the listing of a directory instead of the default HTML page by sending a carefully constructed request.

Update Released: 13th October 2000

Affects: 1.3.12, 1.3.11?, 1.3.9?, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

important: Cross-site scripting can reveal private session information CVE-2000-1205

Apache was vulnerable to cross site scripting issues. It was shown that malicious HTML tags can be embedded in client web requests if the server or script handling the request does not carefully encode all information displayed to the user. Using these vulnerabilities attackers could, for example, obtain copies of your private cookies used to authenticate you to other sites.

Update Released: 25th February 2000

Affects: 1.3.11, 1.3.9, 1.3.6, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0

moderate: Mass virtual hosting security issue CVE-2000-1206

A security problem can occur for sites using mass name-based virtual hosting (using the new mod_vhost_alias module) or with special mod_rewrite rules.

Update Released: 21st January 2000

Affects: 1.3.9, 1.3.6?, 1.3.4?, 1.3.3?, 1.3.2?, 1.3.1?, 1.3.0?

important: Denial of service attack on Win32

There have been a number of important security fixes to Apache on Windows. The most important is that there is much better protection against people trying to access special DOS device names (such as "nul").

Update Released: 11th January 1999

Affects: 1.3.3, 1.3.2, 1.3.1, 1.3.0

important: Multiple header Denial of Service vulnerability CVE-1999-1199

A serious problem exists when a client sends a large number of headers with the same header name. Apache uses up memory faster than the amount of memory required to simply store the received data itself. That is, memory use increases faster and faster as more headers are received, rather than increasing at a constant rate. This makes a denial of service attack based on this method more effective than methods which cause Apache to use memory at a constant rate, since the attacker has to send less data.

Update Released: 23rd September 1998

Affects: 1.3.1, 1.3.0

important: Denial of service attacks

Apache 1.3.2 has better protection against denial of service attacks. These are when people make excessive requests to the server to try and prevent other people using it. In 1.3.2 there are several new directives which can limit the size of requests (these directives all start with the word Limit).

Update Released: 23rd September 1998

Affects: 1.3.1, 1.3.0