This page lists publicly disclosed CVE vulnerabilities affecting apache http_server (linked via NVD CPE). Each row includes severity scores, summaries, and publication dates to help identify and analyze security issues.
| CVE | Summary | Source | Max CVSS | EPSS % | Published | Updated |
|---|---|---|---|---|---|---|
| CVE-2006-20001 | A carefully crafted If: request header can cause a memory read, or write of a single zero byte, in a pool (heap) memory location beyond the header value sent. This could cause the process to crash. This issue affects Apache HTTP Server 2.4.54 and earlier. | [email protected] | 7.5 | 3.55% | 2023-01-17 | 2026-06-16 |
| CVE-2022-31813 | 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. | [email protected] | 9.8 | 3.14% | 2022-06-09 | 2026-06-17 |
| CVE-2022-30556 | 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. | [email protected] | 7.5 | 4.66% | 2022-06-09 | 2026-06-17 |
| CVE-2022-30522 | 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. | [email protected] | 7.5 | 90.41% | 2022-06-09 | 2026-06-17 |
| CVE-2022-29404 | 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. | [email protected] | 7.5 | 5.68% | 2022-06-09 | 2026-06-17 |
| CVE-2022-28615 | 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. | [email protected] | 9.1 | 5.69% | 2022-06-09 | 2026-06-17 |
| CVE-2022-28614 | 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. | [email protected] | 5.3 | 4.40% | 2022-06-09 | 2026-06-17 |
| CVE-2022-28330 | Apache HTTP Server 2.4.53 and earlier on Windows may read beyond bounds when configured to process requests with the mod_isapi module. | [email protected] | 5.3 | 3.38% | 2022-06-09 | 2026-06-17 |
| CVE-2022-26377 | 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. | [email protected] | 7.5 | 19.01% | 2022-06-09 | 2026-06-17 |
| CVE-2022-23943 | 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. | [email protected] | 9.8 | 50.40% | 2022-03-14 | 2026-06-17 |
| CVE-2022-22721 | 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. | [email protected] | 9.1 | 41.86% | 2022-03-14 | 2026-06-17 |
| CVE-2022-22720 | 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 | [email protected] | 9.8 | 28.19% | 2022-03-14 | 2026-06-17 |
| CVE-2022-22719 | 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. | [email protected] | 7.5 | 69.80% | 2022-03-14 | 2026-06-17 |
| CVE-2021-44790 | 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. | [email protected] | 9.8 | 97.11% | 2021-12-20 | 2026-06-17 |
| CVE-2021-44224 | 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). | [email protected] | 8.2 | 82.30% | 2021-12-20 | 2026-06-17 |
| CVE-2021-42013 KEV | 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 | [email protected] | 9.8 | 99.96% | 2021-10-07 | 2026-06-17 |
| CVE-2021-41773 KEV | 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 | [email protected] | 9.8 | 99.99% | 2021-10-05 | 2026-06-17 |
| CVE-2021-41524 | 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. | [email protected] | 7.5 | 24.98% | 2021-10-05 | 2026-06-17 |
| CVE-2021-40438 KEV | 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. | [email protected] | 9.0 | 100.00% | 2021-09-16 | 2026-06-17 |
| CVE-2021-39275 | 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. | [email protected] | 9.8 | 36.34% | 2021-09-16 | 2026-06-17 |