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Apache HTTP Server vulnerabilities

The Apache httpd web server. 553 published CVES affecting Apache HTTP Server, from public sources (CVE.org, NVD, CISA KEV, FIRST EPSS, OSV).

Total
553
Critical
46
High
179
Medium
242
Low
28
Unscored
58
CISA KEV
11
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Latest Apache HTTP Server CVEs

Newest publication first · page 11 of 23

  1. HighCVSS 7.5 EPSS 2.3%

    The Debian build procedure for the smokeping package in wheezy before 2.6.8-2+deb7u1 and jessie before 2.6.9-1+deb8u1 does not properly configure the way Apache httpd passes arguments to smokeping_cgi, which allows remote attackers to execute arbitrary code via crafted CGI argume...

  2. MediumCVSS 5.0 EPSS 12.8%

    The read_request_line function in server/protocol.c in the Apache HTTP Server 2.4.12 does not initialize the protocol structure member, which allows remote attackers to cause a denial of service (NULL pointer dereference and process crash) by sending a request that lacks a method...

  3. MediumCVSS 4.3 EPSS 16.3%

    The ap_some_auth_required function in server/request.c in the Apache HTTP Server 2.4.x before 2.4.14 does not consider that a Require directive may be associated with an authorization setting rather than an authentication setting, which allows remote attackers to bypass intended...

  4. MediumCVSS 5.0 EPSS 74.4%

    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 c...

  5. MediumCVSS 6.8 EPSS 13.5%

    The php_handler function in sapi/apache2handler/sapi_apache2.c in PHP before 5.4.40, 5.5.x before 5.5.24, and 5.6.x before 5.6.8, when the Apache HTTP Server 2.4.x is used, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code...

  6. MediumCVSS 5.0 EPSS 16.9%

    The lua_websocket_read function in lua_request.c in the mod_lua module in the Apache HTTP Server through 2.4.12 allows remote attackers to cause a denial of service (child-process crash) by sending a crafted WebSocket Ping frame after a Lua script has called the wsupgrade functio...

  7. MediumCVSS 4.3 EPSS 22.0%

    mod_lua.c in the mod_lua module in the Apache HTTP Server 2.3.x and 2.4.x through 2.4.10 does not support an httpd configuration in which the same Lua authorization provider is used with different arguments within different contexts, which allows remote attackers to bypass intend...

  8. MediumCVSS 5.0 EPSS 10.0%

    The mod_dav_svn Apache HTTPD server module in Apache Subversion 1.7.x before 1.7.19 and 1.8.x before 1.8.11 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a request for a URI that triggers a lookup for a virtual transaction name that...

  9. MediumCVSS 5.0 EPSS 11.0%

    The mod_dav_svn Apache HTTPD server module in Apache Subversion 1.x before 1.7.19 and 1.8.x before 1.8.11 allows remote attackers to cause a denial of service (NULL pointer dereference and server crash) via a REPORT request for a resource that does not exist.

  10. MediumCVSS 5.0 EPSS 13.5%

    The cache_merge_headers_out function in modules/cache/cache_util.c in the mod_cache module in the Apache HTTP Server before 2.4.11 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty HTTP Content-Type header.

  11. HighCVSS 10.0 EPSS 99.7% CISA KEV added 2025-10-02 Exploited in the wild Framework module Public exploit

    GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attackers to execute arbitrary commands via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH ssh...

  12. HighCVSS 10.0 EPSS 64.3%

    GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code or cause a denial of service (uninitialized memory access, and untrusted-pointer read and write operations)...

  13. CriticalCVSS 9.8 EPSS 99.9% CISA KEV added 2022-01-28 Exploited in the wild Public exploit PoC

    GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed function definitions in the values of environment variables, which allows remote attackers to write to files or possibly have unknown other impact via a crafted environment, as demonstrated by vect...

  14. CriticalCVSS 9.8 EPSS 100.0% CISA KEV added 2022-01-28 Exploited in the wild Framework module Public exploit PoC

    GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the...

  15. MediumCVSS 5.0 EPSS 16.8%

    Memory leak in the winnt_accept function in server/mpm/winnt/child.c in the WinNT MPM in the Apache HTTP Server 2.4.x before 2.4.10 on Windows, when the default AcceptFilter is enabled, allows remote attackers to cause a denial of service (memory consumption) via crafted requests...

Sources: CVE.org, NVD, CISA KEV, FIRST EPSS, OSV and public exploit-reference metadata. Product matching comes from the published CVE records. A proof-of-concept means public code exists; it is not evidence of exploitation.