Apache HTTP Server Security (httpd.org JSON)

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Letzter Fetch Letzter Erfolg Aufeinanderfolgende Fehler Letzte Fehlermeldung ETag Last-Modified
2026-10-21 10:17 UTC 2026-10-21 10:17 UTC 0 - "1f3628-65ddf9e0a9d8b-gzip" Thu, 15 Oct 2026 11:47:50 GMT

Letzte Eintraege

267 Eintraege · 50 pro Seite · Seite 2 von 6

Veroeffentlicht Titel CVEs EPSS-Pctl Severity
2025-07-10 00:00

CVE-2024-43394: 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 vulnerability reports regarding SSRF via UNC paths. The server offers limited protection against administrators directing the server to open UNC paths. Windows servers should limit the hosts they will connect over via SMB based on the nature of NTLM authentication.

CVE-2024-43394

 HIGH
2025-07-10 00:00

CVE-2024-42516: HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the Content-Type response headers of applications hosted or proxied by the server can split the HTTP response. This vulnerability was described as CVE-2023-38709 but the patch included in Apache HTTP Server 2.4.59 did not address the issue. Users are recommended to upgrade to version 2.4.64, which fixes this issue.

CVE-2023-38709
CVE-2024-42516

 HIGH
2025-07-10 00:00

CVE-2024-47252: Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging configuration where CustomLog is used with "%{varname}x" or "%{varname}c" to log variables provided by mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized data provided by the client may appear in log files.

CVE-2024-47252

 HIGH
2025-07-10 00:00

CVE-2025-23048: In some mod_ssl configurations on Apache HTTP Server 2.4.35 through to 2.4.62, an access control bypass by trusted clients is possible using TLS 1.3 session resumption. Configurations are affected when mod_ssl is configured for multiple virtual hosts, with each restricted to a different set of trusted client certificates (for example with a different SSLCACertificateFile/Path setting). In such a case, a client trusted to access one virtual host may be able to access another virtual host, if SSLStrictSNIVHostCheck is not enabled in either virtual host.

CVE-2025-23048

 CRITICAL
2025-07-10 00:00

CVE-2025-49630: 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-2025-49630

 HIGH
2025-07-10 00:00

CVE-2025-49812: 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 for TLS upgrade.

CVE-2025-49812

 HIGH
2025-07-10 00:00

CVE-2025-53020: 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-2025-53020

 HIGH
2025-07-10 00:00

CVE-2024-43204: 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 which fixes this issue.

CVE-2024-43204

 HIGH
2024-07-17 00:00

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 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 are recommended to upgrade to version 2.4.62, which fixes this issue.

CVE-2024-39884
CVE-2024-40725

 MEDIUM
2024-07-17 00:00

CVE-2024-40898: SSRF in Apache HTTP Server on Windows with mod_rewrite in server/vhost context, allows to potentially leak NTLM 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-2024-40898

 CRITICAL
2024-07-03 00:00

CVE-2024-39884: 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 are recommended to upgrade to version 2.4.61, which fixes this issue.

CVE-2024-39884

 MEDIUM
2024-07-01 00:00

CVE-2024-38477: 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-2024-38477

 HIGH
2024-07-01 00:00

CVE-2024-36387: 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-2024-36387

 MEDIUM
2024-07-01 00:00

CVE-2024-38472: 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 processing.

CVE-2024-38472

 HIGH
2024-07-01 00:00

CVE-2024-38473: 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. This affects configurations where mechanisms other than ProxyPass/ProxyPassMatch or RewriteRule with the 'P' flag are used to configure a request to be proxied, such as SetHandler or inadvertent proxying via CVE-2024-39573. Note that these alternate mechanisms may be used within .htaccess. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2024-38473
CVE-2024-39573

 HIGH
2024-07-01 00:00

CVE-2024-39573: 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-2024-39573

 HIGH
2024-07-01 00:00

CVE-2024-38475: 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 backreferences or variables as the first segment of the substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag "UnsafePrefixStat" can be used to opt back in once ensuring the substitution is appropriately constrained.

CVE-2024-38475

 CRITICAL
2024-07-01 00:00

CVE-2024-38476: 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. Note: Some legacy uses of the 'AddType' directive to connect a request to a handler must be ported to 'SetHandler' after this fix. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

CVE-2024-38476

 CRITICAL
2024-07-01 00:00

CVE-2024-38474: 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. Some RewriteRules that capture and substitute unsafely will now fail unless rewrite flag "UnsafeAllow3F" is specified.

CVE-2024-38474

 HIGH
2024-04-04 00:00

CVE-2023-38709: 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-2023-38709

 HIGH
2024-04-04 00:00

CVE-2024-27316: 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-2024-27316

 HIGH
2024-04-04 00:00

CVE-2024-24795: 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-2024-24795

 MEDIUM
2023-10-19 00:00

CVE-2023-31122: Out-of-bounds Read vulnerability in mod_macro of Apache HTTP Server.This issue affects Apache HTTP Server: through 2.4.57.

CVE-2023-31122

 -
2023-10-19 00:00

CVE-2023-45802: When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A client could send new requests and resets, keeping the connection busy and open and causing the memory footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run out of memory before that. This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with their own test client. During "normal" HTTP/2 use, the probability to hit this bug is very low. The kept memory would not become noticeable before the connection closes or times out. Users are recommended to upgrade to version 2.4.58, which fixes the issue.

CVE-2023-44487
CVE-2023-45802

 HIGH
2023-10-19 00:00

CVE-2023-43622: An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known "slow loris" attack pattern. This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which fixes the issue.

CVE-2023-43622

 -
2023-03-07 00:00

CVE-2023-27522: 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-2023-27522

 HIGH
2023-03-07 00:00

CVE-2023-25690: 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.

CVE-2023-25690

 CRITICAL
2023-01-17 00:00

CVE-2022-36760: 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 2.4.54 and prior versions.

CVE-2022-36760

 CRITICAL
2023-01-17 00:00

CVE-2022-37436: Prior to Apache HTTP Server 2.4.55, a malicious backend can cause the response headers to be truncated early, resulting in some headers being incorporated into the response body. If the later headers have any security purpose, they will not be interpreted by the client.

CVE-2022-37436

 MEDIUM
2023-01-17 00:00

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.

CVE-2006-20001

 -
2021-08-06 00:00

CVE-2021-33193: 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-2021-33193

 -
2021-06-01 00:00

CVE-2020-13950: 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-2020-13950

 -
2021-06-01 00:00

CVE-2021-26690: 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-2021-26690

 -
2021-06-01 00:00

CVE-2019-17567: 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-2019-17567

 -
2021-06-01 00:00

CVE-2021-26691: 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-2021-26691

 -
2021-06-01 00:00

CVE-2020-13938: Apache HTTP Server versions 2.4.0 to 2.4.46 Unprivileged local users can stop httpd on Windows

CVE-2020-13938

 -
2021-06-01 00:00

CVE-2020-35452: 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-2020-35452

 -
2021-06-01 00:00

CVE-2021-30641: Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'

CVE-2021-30641

 -
2020-08-07 00:00

CVE-2020-11993: In Apache HTTP Server versions 2.4.20 to 2.4.43, when trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent use of memory pools. Configuring the LogLevel of mod_http2 above "info" will mitigate this vulnerability for unpatched servers.

CVE-2020-11993

 -
2020-08-07 00:00

CVE-2020-11984: In Apache HTTP Server versions 2.4.32 to 2.4.43, mod_proxy_uwsgi has a information disclosure and possible RCE

CVE-2020-11984

 -
2020-08-07 00:00

CVE-2020-11985: For configurations using proxying with mod_remoteip and certain mod_rewrite rules, an attacker could spoof their IP address for logging and PHP scripts. Note this issue was fixed in Apache HTTP Server 2.4.24 but was retrospectively allocated a low severity CVE in 2020.

CVE-2020-11985

 -
2020-08-07 00:00

CVE-2020-9490: In Apache HTTP Server versions 2.4.20 to 2.4.43, a specially crafted value for the 'Cache-Digest' header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via "H2Push off" will mitigate this vulnerability for unpatched servers.

CVE-2020-9490

 -
2020-04-01 00:00

CVE-2020-1927: In Apache HTTP Server versions 2.4.0 to 2.4.41 some mod_rewrite configurations vulnerable to open redirect.

CVE-2020-1927

 -
2020-04-01 00:00

CVE-2020-1934: in Apache HTTP Server versions 2.4.0 to 2.4.41, mod_proxy_ftp use of uninitialized value with malicious FTP backend.

CVE-2020-1934

 -
2019-08-14 00:00

CVE-2019-10092: 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 malfomed 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. We have taken this opportunity to also remove request data from many other in-built error messages. Note however this issue did not affect them directly and their output was already escaped to prevent cross-site scripting attacks.

CVE-2019-10092

 -
2019-08-14 00:00

CVE-2019-10097: 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-2019-10097

 -
2019-08-14 00:00

CVE-2019-9517: A malicious client could perform a DoS attack by flooding a connection with requests and basically never reading responses on the TCP connection. Depending on h2 worker dimensioning, it was possible to block those with relatively few connections.

CVE-2019-9517

 HIGH
2019-08-14 00:00

CVE-2019-10082: Using fuzzed network input, the http/2 session handling could be made to read memory after being freed, during connection shutdown.

CVE-2019-10082

 -
2019-08-14 00:00

CVE-2019-10081: HTTP/2 very early pushes, for example configured with "H2PushResource", could lead to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that of the configured push link header values, not data supplied by the client.

CVE-2019-10081

 -
2019-08-14 00:00

CVE-2019-10098: 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-2019-10098

 -
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