Apache Http Server vulnerabilities

CVE-2020-1927 [MEDIUM] CWE-601 CVE-2020-1927: In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to b In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.

CVE-2002-0654 [MEDIUM] CVE-2002-0654: Apache 2.0 through 2.0.39 on Windows, OS2, and Netware allows remote attackers to determine the full Apache 2.0 through 2.0.39 on Windows, OS2, and Netware allows remote attackers to determine the full pathname of the server via (1) a request for a .var file, which leaks the pathname in the resulting error message, or (2) via an error message that occurs when a script (child process) cannot be invoked.

CVE-2004-0488 [HIGH] CWE-787 CVE-2004-0488: Stack-based buffer overflow in the ssl_util_uuencode_binary function in ssl_util.c for Apache mod_ss Stack-based buffer overflow in the ssl_util_uuencode_binary function in ssl_util.c for Apache mod_ssl, when mod_ssl is configured to trust the issuing CA, may allow remote attackers to execute arbitrary code via a client certificate with a long subject DN.

CVE-2001-0766 [CRITICAL] CWE-178 CVE-2001-0766: Apache on MacOS X Client 10.0.3 with the HFS+ file system allows remote attackers to bypass access r Apache on MacOS X Client 10.0.3 with the HFS+ file system allows remote attackers to bypass access restrictions via a URL that contains some characters whose case is not matched by Apache's filters.

CVE-2004-0940 [HIGH] CWE-131 CVE-2004-0940: Buffer overflow in the get_tag function in mod_include for Apache 1.3.x to 1.3.32 allows local users Buffer overflow in the get_tag function in mod_include for Apache 1.3.x to 1.3.32 allows local users who can create SSI documents to execute arbitrary code as the apache user via SSI (XSSI) documents that trigger a length calculation error.

CVE-2020-1934 [MEDIUM] CWE-908 CVE-2020-1934: In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a malicious FTP server.

CVE-2007-6750 [MEDIUM] CWE-399 CVE-2007-6750: The Apache HTTP Server 1.x and 2.x allows remote attackers to cause a denial of service (daemon outa The Apache HTTP Server 1.x and 2.x allows remote attackers to cause a denial of service (daemon outage) via partial HTTP requests, as demonstrated by Slowloris, related to the lack of the mod_reqtimeout module in versions before 2.2.15.

CVE-2002-2272 [HIGH] CWE-119 CVE-2002-2272: Tomcat 4.0 through 4.1.12, using mod_jk 1.2.1 module on Apache 1.3 through 1.3.27, allows remote att Tomcat 4.0 through 4.1.12, using mod_jk 1.2.1 module on Apache 1.3 through 1.3.27, allows remote attackers to cause a denial of service (desynchronized communications) via an HTTP GET request with a Transfer-Encoding chunked field with invalid values.

CVE-2025-58098 [HIGH] CWE-201 CVE-2025-58098: Apache HTTP Server 2.4.65 and earlier with Server Side Includes (SSI) enabled and mod_cgid (but not Apache HTTP Server 2.4.65 and earlier with Server Side Includes (SSI) enabled and mod_cgid (but not mod_cgi) passes the shell-escaped query string to #exec cmd="..." directives. This issue affects Apache HTTP Server before 2.4.66. Users are recommended to upgrade to version 2.4.66, which fixes the issue.

CVE-2016-2161 [HIGH] CWE-823 CVE-2016-2161: In Apache HTTP Server versions 2.4.0 to 2.4.23, malicious input to mod_auth_digest can cause the ser In Apache HTTP Server versions 2.4.0 to 2.4.23, malicious input to mod_auth_digest can cause the server to crash, and each instance continues to crash even for subsequently valid requests.

CVE-2022-37436 [MEDIUM] CWE-113 CVE-2022-37436: Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncat Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.

CVE-2011-3607 [MEDIUM] CWE-189 CVE-2011-3607: Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, allows local users to gain privileges via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, leading to a heap-based buffer ov

CVE-2026-73637 [HIGH] CWE-416 CVE-2026-73637: Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to ve

CVE-2026-42535 [CRITICAL] CWE-668 CVE-2026-42535: A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to d A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to directly manipulate trusted DAV property databases, potentially causing child process crashes. Users are recommended to upgrade to version 2.4.68, which fixes this issue.

CVE-2018-17199 [HIGH] CWE-384 CVE-2018-17199: In Apache HTTP Server 2.4 release 2.4.37 and prior, mod_session checks the session expiry time befor In Apache HTTP Server 2.4 release 2.4.37 and prior, mod_session checks the session expiry time before decoding the session. This causes session expiry time to be ignored for mod_session_cookie sessions since the expiry time is loaded when the session is decoded.

CVE-2021-30641 [MEDIUM] CVE-2021-30641: Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF' Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'

CVE-2017-15710 [HIGH] CWE-787 CVE-2017-15710: In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configur In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate

CVE-2019-10081 [HIGH] CWE-787 CVE-2019-10081: HTTP/2 (2.4.20 through 2.4.39) very early pushes, for example configured with "H2PushResource", coul HTTP/2 (2.4.20 through 2.4.39) very early pushes, for example configured with "H2PushResource", could lead to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that of the configured push link header values, not data supplied by the client.

CVE-2016-8743 [HIGH] CVE-2016-8743: Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the whitespace accept Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the whitespace accepted from requests and sent in response lines and headers. Accepting these different behaviors represented a security concern when httpd participates in any chain of proxies or interacts with back-end application servers, either through mod_proxy or using conventio

CVE-2018-1333 [HIGH] CWE-400 CVE-2018-1333: By specially crafting HTTP/2 requests, workers would be allocated 60 seconds longer than necessary, By specially crafting HTTP/2 requests, workers would be allocated 60 seconds longer than necessary, leading to worker exhaustion and a denial of service. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.18-2.4.30,2.4.33).