CVE-2013-1862

CVE-2013-1862 affects Apache HTTP Server 2.2.x up to 2.2.24, where mod_rewrite writes log data without sanitizing non‑printable characters. This can allow a remote attacker to execute arbitrary commands by sending an HTTP request containing an escape sequence for a terminal emulator, with some so...

CVE-2018-1301

CVE-2018-1301 affects the Apache HTTP Server (httpd) prior to 2.4.30, caused by an out-of-bounds access after a size limit is reached when reading the HTTP header. Impact described as a crash (low risk for normal usage). Affected component is httpd’s HTTP header parsing; root cause is an out-of-b...

CVE-2014-0117

The vulnerability CVE-2014-0117 affects the Apache HTTP Server, specifically the mod_proxy behavior in the 2.4.x line prior to 2.4.10. When a reverse proxy is enabled, a remote attacker can craft an HTTP Connection header to trigger a denial of service (child process crash). This is documented ac...

CVE-2011-3368

CVE-2011-3368 affects the Apache HTTP Server’s mod_proxy in reverse-proxy configurations. The vulnerability arises when using (1) RewriteRule with the [P] flag or (2) ProxyPassMatch; a remote attacker can craft a URI starting with an initial @ character to force the proxy to connect to an interna...

CVE-2018-1303

CVE-2018-1303: An out-of-bounds read in mod_cache_socache could crash the Apache HTTP Server prior to 2.4.30, enabling a DoS against users of httpd. The issue is discussed across multiple advisories (Debian/ALT Linux/Arch Linux security notes and CentOS RH advisories) and is attributed to imprope...

CVE-2011-4415

The CVE-2011-4415 issue affects the Apache HTTP Server (2.0.x up to 2.0.64 and 2.2.x up to 2.2.21) when mod_setenvif is enabled. The root cause is an integer overflow in ap_pregsub during environment variable handling (SetEnvIf), with a crafted .htaccess and HTTP header causing memory exhaustion ...

CVE-2012-4558

CVE-2012-4558 is an XSS vulnerability in Apache HTTP Server's balancer_handler (mod_proxy_balancer). Remote attackers can inject arbitrary web script/HTML via a crafted string in the manager interface for Apache 2.2.x before 2.2.24-dev and 2.4.x before 2.4.4. Impact is arbitrary script execution ...

CVE-2018-1302

Apache HTTP Server (httpd) before 2.4.30 may write a NULL pointer to freed memory when an HTTP/2 stream is destroyed after handling. This is described as low risk and hard to trigger in standard configurations, with no reproducibility outside debug builds. Affected releases include older 2.4.x li...

CVE-2005-2700

This CVE concerns the Apache mod_ssl module (ssl_engine_kernel.c) where configuring SSLVerifyClient optional at global vhost level fails to enforce SSLVerifyClient require in per-location contexts. Attackers could bypass intended access restrictions by omitting a client certificate. Affected comp...

CVE-2024-38473

The Apache HTTP Server versions 2.4.59 and earlier are affected by an encoding problem within the mod_proxy component. This vulnerability allows request URLs with incorrect encoding to be forwarded to backend services, which may enable an attacker to bypass authentication using specially crafted ...

CVE-2020-13938

CVE-2020-13938 affects Apache HTTP Server 2.4.0–2.4.46. The vulnerability allows unprivileged local users to stop the httpd service on Windows. The connected sources confirm the affected product family and the local-access impact, with public advisories referencing Microsoft Windows behavior and ...

CVE-2022-30522

CVE-2022-30522 affects Apache HTTP Server mod_sed; when input to mod_sed is very large, it can cause excessive memory allocations and aborts, impacting availability. The issue is documented across multiple feeds (e.g., CVE page for 2.4.53 context and later advisories) and is addressed by updating...

CVE-2026-29167

A Use After Free vulnerability exists in the Apache HTTP Server when using the mod_ldap module in a per-directory configuration . This flaw allows an attacker to utilize memory after it has been freed, potentially leading to arbitrary code execution or a denial-of-service attack. The issue affect...

CVE-2024-39573

A potential SSRF vulnerability exists in the mod_rewrite module of Apache HTTP Server version 2.4.59 and earlier . The flaw is caused by insufficient checking of incoming requests, which allows an attacker to cause unsafe RewriteRules to unexpectedly set up URLs to be handled by mod_proxy . To re...

CVE-2024-38472

The Apache HTTP Server on Windows is vulnerable to a Server-Side Request Forgery (SSRF) flaw due to insufficient checking of incoming requests. An attacker can exploit this to leak NTLM hashes to a malicious server via malicious requests or content. To remediate, users should upgrade to version 2...

CVE-2025-58098

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 th...

CVE-2014-3523

CVE-2014-3523 corresponds to a memory leak in the WinNT MPM of Apache HTTP Server 2.4.x on Windows. Specifically, when AcceptFilter is enabled, the winnt_accept function in server/mpm/winnt/child.c can leak memory under crafted requests, leading to denial of service. The vulnerability is tied to ...

CVE-2013-5704

CVE-2013-5704 concerns the Apache HTTP Server mod_headers trailer-header bypass vulnerability. The issue arises when a client places headers in the trailer portion of a chunked request, potentially bypassing RequestHeader unset directives and allowing header manipulation after header processing. ...

CVE-2011-4317

The CVE-2011-4317 issue concerns Apache HTTP Server in reverse proxy configurations (ProxyPassMatch/RewriteRule with [P]). It enables remote access to intranet servers via a malformed URI containing @ and : when the Revision 1179239 patch is applied, reflecting an incomplete fix for CVE-2011-3368...

CVE-2009-1891

CVE-2009-1891 affects the Apache HTTP Server mod_deflate in 2.2.x (notably 2.2.11 and earlier). The issue causes CPU consumption DoS by compressing large files even after the client connection closes. Public advisories across distributions confirm the flaw and its remediation via updated packages...

CVE-2015-3183

CVE-2015-3183 affects the Apache HTTP Server (httpd) via a bug in parsing chunked transfer encoding headers, enabling HTTP request smuggling when handling large chunk sizes or invalid chunk extensions (related to modules/http/http_filters.c). The issue is fixed in downstream advisories and patche...

CVE-2012-0031

CVE-2012-0031 affects Apache HTTP Server 2.2.21 and earlier, specifically scoreboard.c. The vulnerability allows local users to cause a denial of service (daemon crash during shutdown) or potentially other unspecified impact by modifying a type field in a shared scoreboard Memory segment, which l...

CVE-2026-28780

Apache HTTP Server versions through 2.4.66 are vulnerable to a heap-based buffer overflow in the mod_proxy_ajp module. The root cause is an off-by-AJP_HEADER_LEN check in the ajp_msg_check_header function, which allows a malicious AJP server to send a crafted message that causes the server to wri...

CVE-2022-28330

CVE-2022-28330 affects Apache HTTP Server 2.4.53 and earlier on Windows, describing an out-of-bounds read when processing requests with the mod_isapi module. Public references in ALAS advisories indicate the fix is included in httpd 2.4.54 (and related ALT Linux advisories). Mitigation requires u...

CVE-2011-3607

The CVE-2011-3607 issue affects the Apache HTTP Server 2.0.x (up to 2.0.64) and 2.2.x (up to 2.2.21) when mod_setenvif is enabled. An integer overflow in ap_pregsub() in server/util.c can cause a heap-based buffer overflow, enabling local privilege escalation via a crafted .htaccess SetEnvIf dire...

CVE-2011-3639

CVE-2011-3639 affects the Apache HTTP Server mod_proxy when using reverse proxy configurations (RewriteRule/ProxyPassMatch). The initial fix for CVE-2011-3368 did not fully address the issue, allowing a remote attacker to connect to an intranet/hidden server by sending HTTP/0.9 with a malformed U...

CVE-2025-59775

A Server-Side Request Forgery (SSRF) vulnerability exists in Apache HTTP Server on Windows systems. When the configuration has AllowEncodedSlashes On and MergeSlashes Off , the vulnerability allows an attacker to potentially leak NTLM hashes to a malicious server via SSRF and specially crafted re...

CVE-2010-0408

CVE-2010-0408 affects the Apache HTTP Server 2.2.x prior to 2.2.15. The ap_proxy_ajp_request function in mod_proxy_ajp.c mishandles requests when a client sends no request body, allowing remote attackers to trigger a denial of service (backend server outage) by crafting a request. The issue is re...

CVE-2013-4352

CVE-2013-4352 affects Apache HTTP Server (httpd) 2.4.x, specifically the mod_cache cache_storage.c: the cache_invalidate path in forward proxy caching can trigger a NULL pointer dereference, crashing the httpd and causing a Denial of Service. Public disclosures tie this to Apache httpd 2.4.6; mul...

CVE-2010-1452

CVE-2010-1452 affects Apache HTTP Server 2.2.x (before 2.2.16) via the mod_cache and mod_dav components. A request that lacks a path can crash the server, causing a denial of service. Debian advisories and related vendor notes confirm the issue and describe fixes/upgrades to 2.2.16 (and subsequen...

CVE-2011-0419

CVE-2011-0419 is a stack consumption/DoS vulnerability in the APR library’s fnmatch implementation (apr_fnmatch.c) and, for some platforms, in libc’s fnmatch.c. It affects APR < 1.4.3 and Apache HTTP Server

CVE-2015-0228

Apache HTTP Server mod_lua contains a Denial of Service vulnerability in lua_websocket_read (lua_request.c) affecting versions up to 2.4.12. A remote attacker can crash a child process by sending a crafted WebSocket Ping frame after a Lua script has invoked wsupgrade. The provided documents confi...

CVE-2021-31618

CVE-2021-31618 affects the Apache httpd mod_http2 component. The issue is a NULL pointer dereference in the HTTP/2 header handling when size limits are violated, leading to denial of service by crashing the httpd worker process. Affected releases include mod_http2 1.15.17 and Apache httpd 2.4.47 ...

CVE-2009-1890

CVE-2009-1890 affects Apache HTTP Server when used as a reverse proxy. The mod_proxy_http.c mechanism can fail to correctly bound a stream when Content-Length is exceeded, causing a denial-of-service via CPU exhaustion from crafted requests. The issue is specific to the reverse-proxy path in mod_...

CVE-2011-3348

The CVE-2011-3348 issue affects the Apache HTTP Server’s mod_proxy_ajp in combination with mod_proxy_balancer, where certain configurations allow remote attackers to trigger a denial of service by sending a malformed HTTP request. The vulnerability is described as causing a temporary error state ...

CVE-2017-12171

CVE-2017-12171 is a vulnerability reported for Red Hat Enterprise Linux 6.9 with httpd 2.2.15-60. The regression causes comments in the Allow and Deny directives to be parsed incorrectly, potentially allowing a remote attacker to bypass access controls and gain access to a restricted HTTP resourc...

CVE-2023-43622

CVE-2023-43622 affects Apache HTTP Server via the mod_http2 implementation. An attacker opening an HTTP/2 connection with an initial window size of 0 could block handling of that connection indefinitely, potentially exhausting server worker resources in a pattern similar to the slow loris attack....

CVE-2014-3583

CVE-2014-3583 affects Apache HTTP Server 2.4.10 and earlier, where the handle_headers function in mod_proxy_fcgi.c can be triggered by long response headers to cause a denial of service (buffer over-read and daemon crash). The vulnerability stems from the proxy/Fcgi header handling in mod_proxy_f...

CVE-2016-4979

CVE-2016-4979 affects Apache HTTP Server 2.4.18–2.4.20 when mod_http2 and mod_ssl are enabled; it fails to recognize the SSLVerifyClient require directive for HTTP/2 request authorization, enabling bypass of access restrictions by abusing multiple requests on a single connection and renegotiation...

CVE-2026-49975

Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.

CVE-2021-41524

CVE-2021-41524 affects Apache HTTP Server (httpd) 2.4.49, where a null pointer dereference during HTTP/2 request processing can allow external sources to cause a DoS. The flaw was introduced with 2.4.49; no public exploit is shown in the documents. Check Point’s November 2021 advisory maps this C...

CVE-1999-1412

CVE-1999-1412 describes a DoS risk from an interaction between MacOS X 1.0 and Apache HTTP server, where a flood of HTTP GET requests to CGI programs can spawn many processes on affected systems. Connected sources provide concrete details indicating the issue relates to the Apache httpd component...

CVE-2025-53020

The Apache HTTP Server versions 2.4.17 through 2.4.63 are vulnerable to a Late Release of Memory after Effective Lifetime issue. This memory leak vulnerability can be exploited by an attacker to cause a Denial of Service (DoS) , potentially leading to service failure or interruptions. Impacted co...

CVE-2025-66200

A vulnerability in the Apache HTTP Server (versions 2.4.7 through 2.4.65) allows a mod_userdir+suexec bypass via the AllowOverride FileInfo directive. Attackers who can use the RequestHeader directive in an htaccess file can cause certain CGI scripts to execute under an unexpected userid . This i...

CVE-2017-7659

The CVE-2017-7659 issue affects the Apache HTTP Server (mod_http2) where a malicious HTTP/2 request could dereference a NULL pointer and crash the server process. Concrete details across connected docs show this vulnerability in Apache httpd before a fixed release (2.4.26) and are addressed by va...

CVE-2016-8740

CVE-2016-8740 affects Apache HTTP Server mod_http2 when Protocols includes h2/h2c. A memory-exhaustion DoS arises from improper restriction of request-header length in crafted CONTINUATION frames in versions 2.4.17–2.4.23. Connected sources confirm the root cause is header-length handling without...

CVE-2010-2068

CVE-2010-2068 affects Apache HTTP ServerAffected: mod_proxy_http.c in Apache HTTP Server 2.2.9–2.2.15, 2.3.4-alpha, and 2.3.5-alpha on Windows, NetWare, OS/2 in certain proxy worker pool configurations.Root cause: timeout handling in mod_proxy_http did not correctly detect timeouts, allowing a re...

CVE-2016-1546

CVE-2016-1546 affects Apache HTTP Server 2.4.17/2.4.18 with mod_http2 enabled, where there is no limit on the number of simultaneous stream workers for a single HTTP/2 connection. This can allow remote attackers to cause a denial of service (stream-processing outage) via modified flow-control win...

CVE-2012-4557

CVE-2012-4557 affects the Apache HTTP Server, specifically the mod_proxy_ajp module in versions 2.2.12–2.2.21. The vulnerability causes a worker node to enter an error state when a long request-processing time is detected, enabling remote attackers to trigger a denial of service via an expensive ...

CVE-1999-0236

The CVE-1999-0236 entry describes a vulnerability in the ScriptAlias directory handling in NCSA and Apache httpd that allowed attackers to read CGI programs. Affected software is the Apache httpd family utilizing ScriptAlias configuration; the underlying issue is directory handling enabling discl...