Vulnerabilities (CVE)

Filtered by vendor Apache Subscribe
Filtered by product Http Server
CVE Vendors Products Updated CVSS v2 CVSS v3
CVE-2023-25690 1 Apache 1 Http Server 2024-01-02 N/A 9.8 CRITICAL
Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack. Configurations are affected when mod_proxy is enabled along with some form of RewriteRule or ProxyPassMatch in which a non-specific pattern matches some portion of the user-supplied request-target (URL) data and is then re-inserted into the proxied request-target using variable substitution. For example, something like: RewriteEngine on RewriteRule "^/here/(.*)" "http://example.com:8080/elsewhere?$1"; [P] ProxyPassReverse /here/ http://example.com:8080/ Request splitting/smuggling could result in bypass of access controls in the proxy server, proxying unintended URLs to existing origin servers, and cache poisoning. Users are recommended to update to at least version 2.4.56 of Apache HTTP Server.
CVE-2007-4465 1 Apache 1 Http Server 2023-12-22 4.3 MEDIUM N/A
Cross-site scripting (XSS) vulnerability in mod_autoindex.c in the Apache HTTP Server before 2.2.6, when the charset on a server-generated page is not defined, allows remote attackers to inject arbitrary web script or HTML via the P parameter using the UTF-7 charset. NOTE: it could be argued that this issue is due to a design limitation of browsers that attempt to perform automatic content type detection.
CVE-2015-3183 1 Apache 1 Http Server 2023-12-14 5.0 MEDIUM N/A
The chunked transfer coding implementation in the Apache HTTP Server before 2.4.14 does not properly parse chunk headers, which allows remote attackers to conduct HTTP request smuggling attacks via a crafted request, related to mishandling of large chunk-size values and invalid chunk-extension characters in modules/http/http_filters.c.
CVE-2023-27522 3 Apache, Debian, Unbit 3 Http Server, Debian Linux, Uwsgi 2023-08-24 N/A 7.5 HIGH
HTTP Response Smuggling vulnerability in Apache HTTP Server via mod_proxy_uwsgi. This issue affects Apache HTTP Server: from 2.4.30 through 2.4.55. Special characters in the origin response header can truncate/split the response forwarded to the client.
CVE-2021-44224 6 Apache, Apple, Debian and 3 more 11 Http Server, Macos, Debian Linux and 8 more 2022-07-30 6.4 MEDIUM 8.2 HIGH
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 2.4.51 (included).
CVE-2022-22721 3 Apache, Debian, Fedoraproject 3 Http Server, Debian Linux, Fedora 2022-07-25 6.8 MEDIUM 9.8 CRITICAL
If LimitXMLRequestBody is set to allow request bodies larger than 350MB (defaults to 1M) on 32 bit systems an integer overflow happens which later causes out of bounds writes. This issue affects Apache HTTP Server 2.4.52 and earlier.
CVE-2022-22720 3 Apache, Debian, Fedoraproject 3 Http Server, Debian Linux, Fedora 2022-07-25 7.5 HIGH 9.8 CRITICAL
Apache HTTP Server 2.4.52 and earlier fails to close inbound connection when errors are encountered discarding the request body, exposing the server to HTTP Request Smuggling
CVE-2020-1927 8 Apache, Broadcom, Canonical and 5 more 14 Http Server, Brocade Fabric Operating System, Ubuntu Linux and 11 more 2022-07-25 5.8 MEDIUM 6.1 MEDIUM
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-2019-10082 2 Apache, Oracle 6 Http Server, Communications Element Manager, Enterprise Manager Ops Center and 3 more 2022-07-25 6.4 MEDIUM 9.1 CRITICAL
In Apache HTTP Server 2.4.18-2.4.39, using fuzzed network input, the http/2 session handling could be made to read memory after being freed, during connection shutdown.
CVE-2019-0220 5 Apache, Canonical, Debian and 2 more 5 Http Server, Ubuntu Linux, Debian Linux and 2 more 2022-07-25 5.0 MEDIUM 5.3 MEDIUM
A vulnerability was found in Apache HTTP Server 2.4.0 to 2.4.38. When the path component of a request URL contains multiple consecutive slashes ('/'), directives such as LocationMatch and RewriteRule must account for duplicates in regular expressions while other aspects of the servers processing will implicitly collapse them.
CVE-2022-30556 1 Apache 1 Http Server 2022-07-06 5.0 MEDIUM 7.5 HIGH
Apache HTTP Server 2.4.53 and earlier may return lengths to applications calling r:wsread() that point past the end of the storage allocated for the buffer.
CVE-2022-29404 1 Apache 1 Http Server 2022-07-06 5.0 MEDIUM 7.5 HIGH
In Apache HTTP Server 2.4.53 and earlier, a malicious request to a lua script that calls r:parsebody(0) may cause a denial of service due to no default limit on possible input size.
CVE-2022-26377 1 Apache 1 Http Server 2022-07-06 5.0 MEDIUM 7.5 HIGH
Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in mod_proxy_ajp of Apache HTTP Server allows an attacker to smuggle requests to the AJP server it forwards requests to. This issue affects Apache HTTP Server Apache HTTP Server 2.4 version 2.4.53 and prior versions.
CVE-2022-28615 1 Apache 1 Http Server 2022-07-06 6.4 MEDIUM 9.1 CRITICAL
Apache HTTP Server 2.4.53 and earlier may crash or disclose information due to a read beyond bounds in ap_strcmp_match() when provided with an extremely large input buffer. While no code distributed with the server can be coerced into such a call, third-party modules or lua scripts that use ap_strcmp_match() may hypothetically be affected.
CVE-2022-30522 1 Apache 1 Http Server 2022-07-06 5.0 MEDIUM 7.5 HIGH
If Apache HTTP Server 2.4.53 is configured to do transformations with mod_sed in contexts where the input to mod_sed may be very large, mod_sed may make excessively large memory allocations and trigger an abort.
CVE-2022-28614 1 Apache 1 Http Server 2022-07-06 5.0 MEDIUM 5.3 MEDIUM
The ap_rwrite() function in Apache HTTP Server 2.4.53 and earlier may read unintended memory if an attacker can cause the server to reflect very large input using ap_rwrite() or ap_rputs(), such as with mod_luas r:puts() function. Modules compiled and distributed separately from Apache HTTP Server that use the 'ap_rputs' function and may pass it a very large (INT_MAX or larger) string must be compiled against current headers to resolve the issue.
CVE-2022-31813 1 Apache 1 Http Server 2022-07-06 7.5 HIGH 9.8 CRITICAL
Apache HTTP Server 2.4.53 and earlier may not send the X-Forwarded-* headers to the origin server based on client side Connection header hop-by-hop mechanism. This may be used to bypass IP based authentication on the origin server/application.
CVE-2022-28330 2 Apache, Microsoft 2 Http Server, Windows 2022-06-24 5.0 MEDIUM 5.3 MEDIUM
Apache HTTP Server 2.4.53 and earlier on Windows may read beyond bounds when configured to process requests with the mod_isapi module.
CVE-2022-23943 4 Apache, Debian, Fedoraproject and 1 more 5 Http Server, Debian Linux, Fedora and 2 more 2022-06-17 7.5 HIGH 9.8 CRITICAL
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-2021-34798 7 Apache, Broadcom, Debian and 4 more 14 Http Server, Brocade Fabric Operating System Firmware, Debian Linux and 11 more 2022-06-14 5.0 MEDIUM 7.5 HIGH
Malformed requests may cause the server to dereference a NULL pointer. This issue affects Apache HTTP Server 2.4.48 and earlier.
CVE-2021-40438 6 Apache, Debian, F5 and 3 more 9 Http Server, Debian Linux, F5os and 6 more 2022-06-14 6.8 MEDIUM 9.0 CRITICAL
A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.
CVE-2021-39275 5 Apache, Debian, Fedoraproject and 2 more 7 Http Server, Debian Linux, Fedora and 4 more 2022-06-14 7.5 HIGH 9.8 CRITICAL
ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache HTTP Server 2.4.48 and earlier.
CVE-2021-42013 4 Apache, Fedoraproject, Netapp and 1 more 5 Http Server, Fedora, Cloud Backup and 2 more 2022-06-09 7.5 HIGH 9.8 CRITICAL
It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.
CVE-2022-22719 3 Apache, Debian, Fedoraproject 3 Http Server, Debian Linux, Fedora 2022-05-17 5.0 MEDIUM 7.5 HIGH
A carefully crafted request body can cause a read to a random memory area which could cause the process to crash. This issue affects Apache HTTP Server 2.4.52 and earlier.
CVE-2021-44790 6 Apache, Debian, Fedoraproject and 3 more 6 Http Server, Debian Linux, Fedora and 3 more 2022-05-17 7.5 HIGH 9.8 CRITICAL
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-2021-36160 6 Apache, Broadcom, Debian and 3 more 13 Http Server, Brocade Fabric Operating System Firmware, Debian Linux and 10 more 2022-05-13 5.0 MEDIUM 7.5 HIGH
A carefully crafted request uri-path can cause mod_proxy_uwsgi to read above the allocated memory and crash (DoS). This issue affects Apache HTTP Server versions 2.4.30 to 2.4.48 (inclusive).
CVE-2021-32792 3 Apache, Fedoraproject, Zmartzone 3 Http Server, Fedora, Mod Auth Openidc 2022-05-10 4.3 MEDIUM 6.1 MEDIUM
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.
CVE-2021-32791 3 Apache, Fedoraproject, Zmartzone 3 Http Server, Fedora, Mod Auth Openidc 2022-05-10 4.3 MEDIUM 5.9 MEDIUM
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has been patched to use dynamic values through usage of cjose AES encryption routines.
CVE-2021-32785 2 Apache, Zmartzone 2 Http Server, Mod Auth Openidc 2022-05-10 4.3 MEDIUM 7.5 HIGH
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. When mod_auth_openidc versions prior to 2.4.9 are configured to use an unencrypted Redis cache (`OIDCCacheEncrypt off`, `OIDCSessionType server-cache`, `OIDCCacheType redis`), `mod_auth_openidc` wrongly performed argument interpolation before passing Redis requests to `hiredis`, which would perform it again and lead to an uncontrolled format string bug. Initial assessment shows that this bug does not appear to allow gaining arbitrary code execution, but can reliably provoke a denial of service by repeatedly crashing the Apache workers. This bug has been corrected in version 2.4.9 by performing argument interpolation only once, using the `hiredis` API. As a workaround, this vulnerability can be mitigated by setting `OIDCCacheEncrypt` to `on`, as cache keys are cryptographically hashed before use when this option is enabled.
CVE-2021-32786 3 Apache, Fedoraproject, Zmartzone 3 Http Server, Fedora, Mod Auth Openidc 2022-05-10 5.8 MEDIUM 6.1 MEDIUM
mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9, `oidc_validate_redirect_url()` does not parse URLs the same way as most browsers do. As a result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout functionality. This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect with slashes to address a particular breaking change between the different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring `mod_auth_openidc` to only allow redirection whose destination matches a given regular expression.
CVE-2021-33193 4 Apache, Fedoraproject, Oracle and 1 more 5 Http Server, Fedora, Secure Backup and 2 more 2022-05-10 5.0 MEDIUM 7.5 HIGH
A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
CVE-2020-1934 6 Apache, Canonical, Debian and 3 more 11 Http Server, Ubuntu Linux, Debian Linux and 8 more 2022-04-26 5.0 MEDIUM 5.3 MEDIUM
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-2021-41773 2 Apache, Fedoraproject 2 Http Server, Fedora 2022-02-07 4.3 MEDIUM 7.5 HIGH
A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.
CVE-2021-41524 2 Apache, Fedoraproject 2 Http Server, Fedora 2022-02-07 5.0 MEDIUM 7.5 HIGH
While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.
CVE-2021-26691 4 Apache, Debian, Fedoraproject and 1 more 6 Http Server, Debian Linux, Fedora and 3 more 2022-02-07 7.5 HIGH 9.8 CRITICAL
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-2021-31618 4 Apache, Debian, Fedoraproject and 1 more 6 Http Server, Debian Linux, Fedora and 3 more 2021-12-10 5.0 MEDIUM 7.5 HIGH
Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.
CVE-2021-30641 4 Apache, Debian, Fedoraproject and 1 more 6 Http Server, Debian Linux, Fedora and 3 more 2021-12-02 5.0 MEDIUM 5.3 MEDIUM
Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'
CVE-2019-17567 3 Apache, Fedoraproject, Oracle 5 Http Server, Fedora, Enterprise Manager Ops Center and 2 more 2021-12-02 5.0 MEDIUM 5.3 MEDIUM
Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an URL that is not necessarily Upgraded by the origin server was tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP validation, authentication or authorization possibly configured.
CVE-2021-26690 4 Apache, Debian, Fedoraproject and 1 more 6 Http Server, Debian Linux, Fedora and 3 more 2021-12-01 5.0 MEDIUM 7.5 HIGH
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service
CVE-2020-35452 4 Apache, Debian, Fedoraproject and 1 more 6 Http Server, Debian Linux, Fedora and 3 more 2021-12-01 6.8 MEDIUM 7.3 HIGH
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow
CVE-2020-13950 4 Apache, Debian, Fedoraproject and 1 more 6 Http Server, Debian Linux, Fedora and 3 more 2021-12-01 5.0 MEDIUM 7.5 HIGH
Apache HTTP Server versions 2.4.41 to 2.4.46 mod_proxy_http can be made to crash (NULL pointer dereference) with specially crafted requests using both Content-Length and Transfer-Encoding headers, leading to a Denial of Service
CVE-1999-1412 2 Apache, Apple 2 Http Server, Macos 2021-09-22 5.0 MEDIUM N/A
A possible interaction between Apple MacOS X release 1.0 and Apache HTTP server allows remote attackers to cause a denial of service (crash) via a flood of HTTP GET requests to CGI programs, which generates a large number of processes.
CVE-2020-13938 2 Apache, Microsoft 2 Http Server, Windows 2021-09-21 2.1 LOW 5.5 MEDIUM
Apache HTTP Server versions 2.4.0 to 2.4.46 Unprivileged local users can stop httpd on Windows
CVE-2019-10092 8 Apache, Canonical, Debian and 5 more 10 Http Server, Ubuntu Linux, Debian Linux and 7 more 2021-09-09 4.3 MEDIUM 6.1 MEDIUM
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 the Proxy Error page was displayed.
CVE-2019-0190 3 Apache, Openssl, Oracle 6 Http Server, Openssl, Enterprise Manager Ops Center and 3 more 2021-07-20 5.0 MEDIUM 7.5 HIGH
A bug exists in the way mod_ssl handled client renegotiations. A remote attacker could send a carefully crafted request that would cause mod_ssl to enter a loop leading to a denial of service. This bug can be only triggered with Apache HTTP Server version 2.4.37 when using OpenSSL version 1.1.1 or later, due to an interaction in changes to handling of renegotiation attempts.
CVE-2019-10097 2 Apache, Oracle 8 Http Server, Communications Element Manager, Communications Session Report Manager and 5 more 2021-07-07 6.0 MEDIUM 7.2 HIGH
In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip was configured to use a trusted intermediary proxy server using the "PROXY" protocol, a specially crafted PROXY header could trigger a stack buffer overflow or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by untrusted HTTP clients.
CVE-2018-17189 7 Apache, Canonical, Debian and 4 more 13 Http Server, Ubuntu Linux, Debian Linux and 10 more 2021-07-06 5.0 MEDIUM 5.3 MEDIUM
In Apache HTTP server versions 2.4.37 and prior, by sending request bodies in a slow loris way to plain resources, the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming data. This affects only HTTP/2 (mod_http2) connections.
CVE-2001-0925 2 Apache, Debian 2 Http Server, Debian Linux 2021-07-06 5.0 MEDIUM N/A
The default installation of Apache before 1.3.19 allows remote attackers to list directories instead of the multiview index.html file via an HTTP request for a path that contains many / (slash) characters, which causes the path to be mishandled by (1) mod_negotiation, (2) mod_dir, or (3) mod_autoindex.
CVE-2019-10098 1 Apache 1 Http Server 2021-06-14 5.8 MEDIUM 6.1 MEDIUM
In Apache HTTP server 2.4.0 to 2.4.39, Redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an unexpected URL within the request URL.
CVE-2000-1205 1 Apache 1 Http Server 2021-06-06 4.3 MEDIUM N/A
Cross site scripting vulnerabilities in Apache 1.3.0 through 1.3.11 allow remote attackers to execute script as other web site visitors via (1) the printenv CGI (printenv.pl), which does not encode its output, (2) pages generated by the ap_send_error_response function such as a default 404, which does not add an explicit charset, or (3) various messages that are generated by certain Apache modules or core code. NOTE: the printenv issue might still exist for web browsers that can render text/plain content types as HTML, such as Internet Explorer, but CVE regards this as a design limitation of those browsers, not Apache. The printenv.pl/acuparam vector, discloser on 20070724, is one such variant.