Apache Http Server vulnerabilities

CVE-2025-49812 [HIGH] CWE-287 CVE-2025-49812: In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchroni In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommended to upgrade to version 2.4.64, which removes support

CVE-2025-53020 [HIGH] CWE-401 CVE-2025-53020: Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. This issue aff Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63. Users are recommended to upgrade to version 2.4.64, which fixes the issue.

CVE-2025-49630 [HIGH] CWE-617 CVE-2025-49630: In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4. In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".

CVE-2024-43394 [HIGH] CWE-918 CVE-2024-43394: Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via mod_rewrite or apache expressions that pass unvalidated request input. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.63. Note: The Apache HTTP Server Project will be setting a higher bar for accepting vu

CVE-2024-43204 [HIGH] CWE-918 CVE-2024-43204: SSRF in Apache HTTP Server with mod_proxy loaded allows an attacker to send outbound proxy requests SSRF in Apache HTTP Server with mod_proxy loaded allows an attacker to send outbound proxy requests to a URL controlled by the attacker. Requires an unlikely configuration where mod_headers is configured to modify the Content-Type request or response header with a value provided in the HTTP request. Users are recommended to upgrade to version 2.4.64 w

CVE-2024-40898 [HIGH] CWE-918 CVE-2024-40898: SSRF in Apache HTTP Server on Windows with mod_rewrite in server/vhost context, allows to potentiall SSRF in Apache HTTP Server on Windows with mod_rewrite in server/vhost context, allows to potentially leak NTML hashes to a malicious server via SSRF and malicious requests. Users are recommended to upgrade to version 2.4.62 which fixes this issue.

CVE-2024-40725 [MEDIUM] CVE-2024-40725: A partial fix for  CVE-2024-39884 in the core of Apache HTTP Server 2.4.61 ignores some use of the l A partial fix for CVE-2024-39884 in the core of Apache HTTP Server 2.4.61 ignores some use of the legacy content-type based configuration of handlers. "AddType" and similar configuration, under some circumstances where files are requested indirectly, result in source code disclosure of local content. For example, PHP scripts may be served instead of interpr

CVE-2024-39884 [MEDIUM] CWE-668 CVE-2024-39884: A regression in the core of Apache HTTP Server 2.4.60 ignores some use of the legacy content-type ba A regression in the core of Apache HTTP Server 2.4.60 ignores some use of the legacy content-type based configuration of handlers. "AddType" and similar configuration, under some circumstances where files are requested indirectly, result in source code disclosure of local content. For example, PHP scripts may be served instead of interpreted. Users

CVE-2024-38475 [CRITICAL] CWE-116 CVE-2024-38475: Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attack Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. Substitutions in server context that use a backrefe

CVE-2024-38476 [CRITICAL] CWE-829 CVE-2024-38476: Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are vulnerably to information disclos Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are vulnerably to information disclosure, SSRF or local script execution via backend applications whose response headers are malicious or exploitable. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2024-38474 [CRITICAL] CWE-116 CVE-2024-38474: Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to execute scripts in directories permitted by the configuration but not directly reachable by any URL or source disclosure of scripts meant to only to be executed as CGI. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2024-38477 [HIGH] CWE-476 CVE-2024-38477: null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to crash the server via a malicious request. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2024-38472 [HIGH] CWE-918 CVE-2024-38472: SSRF in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server v SSRF in Apache HTTP Server on Windows allows to potentially leak NTLM hashes to a malicious server via SSRF and malicious requests or content Users are recommended to upgrade to version 2.4.60 which fixes this issue. Note: Existing configurations that access UNC paths will have to configure new directive "UNCList" to allow access during request proces

CVE-2024-38473 [HIGH] CWE-116 CVE-2024-38473: Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with inco Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2024-39573 [HIGH] CWE-20 CVE-2024-39573: Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to cause u Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to cause unsafe RewriteRules to unexpectedly setup URL's to be handled by mod_proxy. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2024-36387 [MEDIUM] CWE-476 CVE-2024-36387: Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer derefere Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance.

CVE-2024-27316 [HIGH] CWE-770 CVE-2024-27316: HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate HTTP/2 incoming headers exceeding the limit are temporarily buffered in nghttp2 in order to generate an informative HTTP 413 response. If a client does not stop sending headers, this leads to memory exhaustion.

CVE-2023-38709 [HIGH] CWE-1284 CVE-2023-38709: Faulty input validation in the core of Apache allows malicious or exploitable backend/content genera Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators to split HTTP responses. This issue affects Apache HTTP Server: through 2.4.58.

CVE-2024-24795 [MEDIUM] CWE-113 CVE-2024-24795: HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack. Users are recommended to upgrade to version 2.4.59, which fixes this issue.

CVE-2023-31122 [HIGH] CWE-125 CVE-2023-31122: Out-of-bounds Read vulnerability in mod_macro of Apache HTTP Server.This issue affects Apache HTTP S Out-of-bounds Read vulnerability in mod_macro of Apache HTTP Server.This issue affects Apache HTTP Server: through 2.4.57.