Apache Http Server vulnerabilities

CVE-2017-7668 [HIGH] CWE-126 CVE-2017-7668: The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token li The HTTP strict parsing changes added in Apache httpd 2.2.32 and 2.4.24 introduced a bug in token list parsing, which allows ap_find_token() to search past the end of its input string. By maliciously crafting a sequence of request headers, an attacker may be able to cause a segmentation fault, or to force ap_find_token() to return an incorrect value.

CVE-2018-11763 [MEDIUM] CVE-2018-11763: In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can oc In Apache HTTP Server 2.4.17 to 2.4.34, by sending continuous, large SETTINGS frames a client can occupy a connection, server thread and CPU time without any connection timeout coming to effect. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol.

CVE-2021-44790 [CRITICAL] CWE-787 CVE-2021-44790: A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:pars A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and earlier.

CVE-2010-0425 [CRITICAL] CVE-2010-0425: modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 t modules/arch/win32/mod_isapi.c in mod_isapi in the Apache HTTP Server 2.0.37 through 2.0.63, 2.2.0 through 2.2.14, and 2.3.x before 2.3.7, when running on Windows, does not ensure that request processing is complete before calling isapi_unload for an ISAPI .dll module, which allows remote attackers to execute arbitrary code via unspecified vectors related t

CVE-2026-23918 [HIGH] CWE-415 CVE-2026-23918: Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This iss Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

CVE-2024-38472 [HIGH] CWE-918 CVE-2024-38472: SSRF in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server v SSRF in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via SSRF and malicious requests or content Users are recommended to upgrade to version 2.4.60 which fixes this issue. Note: Existing configurations that access UNC paths will have to configure new directive "UNCList" to allow access during request proces

CVE-2006-3747 [HIGH] CWE-189 CVE-2006-3747: Off-by-one error in the ldap scheme handling in the Rewrite module (mod_rewrite) in Apache 1.3 from Off-by-one error in the ldap scheme handling in the Rewrite module (mod_rewrite) in Apache 1.3 from 1.3.28, 2.0.46 and other versions before 2.0.59, and 2.2, when RewriteEngine is enabled, allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted URLs that are not properly handled using certa

CVE-2014-0226 [MEDIUM] CWE-362 CVE-2014-0226: Race condition in the mod_status module in the Apache HTTP Server before 2.4.10 allows remote attack Race condition in the mod_status module in the Apache HTTP Server before 2.4.10 allows remote attackers to cause a denial of service (heap-based buffer overflow), or possibly obtain sensitive credential information or execute arbitrary code, via a crafted request that triggers improper scoreboard handling within the status_handler function in modules/

CVE-2016-8740 [HIGH] CWE-20 CVE-2016-8740: The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configurati The mod_http2 module in the Apache HTTP Server 2.4.17 through 2.4.23, when the Protocols configuration includes h2 or h2c, does not restrict request-header length, which allows remote attackers to cause a denial of service (memory consumption) via crafted CONTINUATION frames in an HTTP/2 request.

CVE-2024-38473 [HIGH] CWE-116 CVE-2024-38473: Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with inco Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2011-3368 [MEDIUM] CWE-20 CVE-2011-3368: The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21 does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an initi

CVE-2019-10092 [MEDIUM] CWE-79 CVE-2019-10092: In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point to a page of their choice. This would only be exploitable where a server was set up with proxying enabled but was misconfigured in such a way that

CVE-2009-1955 [HIGH] CWE-776 CVE-2009-1955: The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFI

CVE-2002-0661 [HIGH] CVE-2002-0661: Directory traversal vulnerability in Apache 2.0 through 2.0.39 on Windows, OS2, and Netware allows r Directory traversal vulnerability in Apache 2.0 through 2.0.39 on Windows, OS2, and Netware allows remote attackers to read arbitrary files and execute commands via .. (dot dot) sequences containing \ (backslash) characters.

CVE-2002-0061 [HIGH] CWE-78 CVE-2002-0061: Apache for Win32 before 1.3.24, and 2.0.x before 2.0.34-beta, allows remote attackers to execute arb Apache for Win32 before 1.3.24, and 2.0.x before 2.0.34-beta, allows remote attackers to execute arbitrary commands via shell metacharacters (a | pipe character) provided as arguments to batch (.bat) or .cmd scripts, which are sent unfiltered to the shell interpreter, typically cmd.exe.

CVE-2021-26691 [CRITICAL] CWE-122 CVE-2021-26691: In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin s In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow

CVE-2022-23943 [CRITICAL] CWE-190 CVE-2022-23943: Out-of-bounds Write vulnerability in mod_sed of Apache HTTP Server allows an attacker to overwrite h Out-of-bounds Write vulnerability in mod_sed of Apache HTTP Server allows an attacker to overwrite heap memory with possibly attacker provided data. This issue affects Apache HTTP Server 2.4 version 2.4.52 and prior versions.

CVE-2004-0493 [MEDIUM] CVE-2004-0493: The ap_get_mime_headers_core function in Apache httpd 2.0.49 allows remote attackers to cause a deni The ap_get_mime_headers_core function in Apache httpd 2.0.49 allows remote attackers to cause a denial of service (memory exhaustion), and possibly an integer signedness error leading to a heap-based buffer overflow on 64 bit systems, via long header lines with large numbers of space or tab characters.

CVE-1999-1053 [HIGH] CVE-1999-1053: guestbook.pl cleanses user-inserted SSI commands by removing text between "<!--" and "-->" separator guestbook.pl cleanses user-inserted SSI commands by removing text between "" separators, which allows remote attackers to execute arbitrary commands when guestbook.pl is run on Apache 1.3.9 and possibly other versions, since Apache allows other closing sequences besides "-->".

CVE-2021-44224 [HIGH] CWE-476 CVE-2021-44224: A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to