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.

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.

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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)

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)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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)

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)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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)

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)

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)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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)

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)

Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server.

Security Fix(es):

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)

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)

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Encoding problem in mod_proxy (CVE-2024-38473)

• httpd: Substitution encoding issue in mod_rewrite (CVE-2024-38474)

• httpd: Improper escaping of output in mod_rewrite (CVE-2024-38475)

• httpd: NULL pointer dereference in mod_proxy (CVE-2024-38477)

• httpd: Potential SSRF in mod_rewrite (CVE-2024-39573)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Improper escaping of output in mod_rewrite (CVE-2024-38475)

• httpd: Substitution encoding issue in mod_rewrite (CVE-2024-38474)

• httpd: null pointer dereference in mod_proxy (CVE-2024-38477)

• httpd: Potential SSRF in mod_rewrite (CVE-2024-39573)

• httpd: Encoding problem in mod_proxy (CVE-2024-38473)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Encoding problem in mod_proxy (CVE-2024-38473)
• httpd: Substitution encoding issue in mod_rewrite (CVE-2024-38474)
• httpd: Improper escaping of output in mod_rewrite (CVE-2024-38475)
• httpd: NULL pointer dereference in mod_proxy (CVE-2024-38477)
• httpd: Potential SSRF in mod_rewrite (CVE-2024-39573)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

• httpd: Improper escaping of output in mod_rewrite (CVE-2024-38475)
• httpd: Substitution encoding issue in mod_rewrite (CVE-2024-38474)
• httpd: null pointer dereference in mod_proxy (CVE-2024-38477)
• httpd: Potential SSRF in mod_rewrite (CVE-2024-39573)
• httpd: Encoding problem in mod_proxy (CVE-2024-38473)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

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-2024-38474: mod_rewrite: server weakness with encoded question marks in backreferences
• CVE-2024-38475: mod_rewrite: server weakness in mod_rewrite when first segment of substitution matches filesystem path
• CVE-2024-38477: mod_proxy: crash resulting in Denial of Service in mod_proxy via a malicious request
• CVE-2024-38476: http: server use exploitable/malicious backend application output to run local handlers via internal redirect
• CVE-2024-39573: mod_rewrite: proxy handler substitution

• CVE-2024-38474: mod_rewrite: server weakness with encoded question marks in backreferences
• CVE-2024-38475: mod_rewrite: server weakness in mod_rewrite when first segment of substitution matches filesystem path
• CVE-2024-38477: mod_proxy: crash resulting in Denial of Service in mod_proxy via a malicious request
• CVE-2023-38709: http_filters: HTTP response splitting
• CVE-2024-38473: mod_proxy: server proxy encoding problem
• CVE-2024-39573: mod_rewrite: proxy handler substitution
• CVE-2024-38476: http: server use exploitable/malicious backend application output to run local handlers via internal redirect
• CVE-2024-39884: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-38476 fix
• CVE-2024-40725: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-39884 fix

• CVE-2024-38474: mod_rewrite: server weakness with encoded question marks in backreferences
• CVE-2024-38475: mod_rewrite: server weakness in mod_rewrite when first segment of substitution matches filesystem path
• CVE-2024-38477: mod_proxy: crash resulting in Denial of Service in mod_proxy via a malicious request
• CVE-2023-38709: http_filters: HTTP response splitting
• CVE-2024-38473: mod_proxy: server proxy encoding problem
• CVE-2024-39573: mod_rewrite: proxy handler substitution
• CVE-2024-38476: http: server use exploitable/malicious backend application output to run local handlers via internal redirect
• CVE-2024-39884: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-38476 fix
• CVE-2024-40725: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-39884 fix

• CVE-2024-38474: mod_rewrite: server weakness with encoded question marks in backreferences
• CVE-2024-38475: mod_rewrite: server weakness in mod_rewrite when first segment of substitution matches filesystem path
• CVE-2024-38477: mod_proxy: crash resulting in Denial of Service in mod_proxy via a malicious request
• CVE-2023-38709: http_filters: HTTP response splitting
• CVE-2024-38473: mod_proxy: server proxy encoding problem
• CVE-2024-39573: mod_rewrite: proxy handler substitution
• CVE-2024-38476: http: server use exploitable/malicious backend application output to run local handlers via internal redirect
• CVE-2024-39884: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-38476 fix
• CVE-2024-40725: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-39884 fix

• CVE-2024-38474: mod_rewrite: server weakness with encoded question marks in backreferences
• CVE-2024-38475: mod_rewrite: server weakness in mod_rewrite when first segment of substitution matches filesystem path
• CVE-2024-38477: mod_proxy: crash resulting in Denial of Service in mod_proxy via a malicious request
• CVE-2024-38473: mod_proxy: server proxy encoding problem
• CVE-2024-39573: mod_rewrite: proxy handler substitution
• CVE-2024-38476: http: server use exploitable/malicious backend application output to run local handlers via internal redirect
• CVE-2024-39884: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-38476 fix
• CVE-2024-40725: modules: source code disclosure with handlers configured via AddType. Resolving regression introduced by CVE-2024-39884 fix

• SECURITY UPDATE: null pointer dereference in mod_proxy
  • debian/patches/CVE-2024-38477.patch: prevent crash resulting in Denial of Service in mod_proxy via a malicious request
  • CVE-2024-38477

• SECURITY UPDATE: null pointer dereference in mod_proxy
  • debian/patches/CVE-2024-38477.patch: prevent crash resulting in Denial of Service in mod_proxy via a malicious request
  • CVE-2024-38477

• SECURITY UPDATE: null pointer dereference in mod_proxy
  • debian/patches/CVE-2024-38477.patch: validate hostname in modules/proxy/proxy_util.c. Restart from the original URL on reconnect in modules/http2/mod_proxy_http2.c.
  • CVE-2024-38477

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) 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. (CVE-2024-38473) 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. Some RewriteRules that capture and substitute unsafely will now fail unless rewrite flag "UnsafeAllow3F" is specified. (CVE-2024-38474) 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) 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. (CVE-2024-38476) 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. (CVE-2024-38477) 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. (CVE-2024-39573) 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. (CVE-2024-39884)

These are all security issues fixed in the apache2-2.4.61-1.1 package on the GA media of openSUSE Tumbleweed.

This update for apache2 fixes the following issues:

• CVE-2024-38477: Fixed null pointer dereference in mod_proxy (bsc#1227270)
• CVE-2024-39573: Fixed potential SSRF in mod_rewrite (bsc#1227271)

This update for apache2 fixes the following issues:

Security fixes:

• CVE-2024-38477: Fixed null pointer dereference in mod_proxy (bsc#1227270)
• CVE-2024-39573: Fixed potential SSRF in mod_rewrite (bsc#1227271)
• CVE-2024-38475: Fixed improper escaping of output in mod_rewrite (bsc#1227268)

Other fixes:

• Fixed regression of security fix (bsc#1226217)

This update for apache2 fixes the following issues:

• CVE-2024-38475: Fixed improper escaping of output in mod_rewrite (bsc#1227268)
• CVE-2024-38476: Fixed server may use exploitable/malicious backend application output to run local handlers via internal redirect (bsc#1227269)
• CVE-2024-38477: Fixed null pointer dereference in mod_proxy (bsc#1227270)
• CVE-2024-39573: Fixed potential SSRF in mod_rewrite (bsc#1227271)

This update for apache2 fixes the following issues:

• CVE-2024-38477: Fixed null pointer dereference in mod_proxy (bsc#1227270).
• CVE-2024-39573: Fixed source code disclosure with handlers configured via AddType (bsc#1227271).
• CVE-2024-39884: Fixed source code disclosure of local content (bsc#1227353).
• CVE-2024-40725: Fixed potential SSRF in mod_rewrite (bsc#1228097).

Other bugfixes:

• Fixed a regression in module loading due to missing sym ap_thread_create (bsc#1233165).

This update for apache2 fixes the following issues

• CVE-2026-23918: http2: double free and possible RCE on early reset (bsc#1263957).
• CVE-2026-24072: mod_rewrite elevation of privileges via ap_expr (bsc#1263935).
• CVE-2026-28780: heap buffer overflow in mod_proxy_ajp via ajp_msg_check_header() (bsc#1264163).
• CVE-2026-29167: mod_ldap per-dir use-after-free (bsc#1267976).
• CVE-2026-29168: allocation of resources without limits in mod_md via OCSP response (bsc#1264150).
• CVE-2026-29169: NULL pointer dereference in mod_dav_lock allows server crash via malicious requests (bsc#1263956).
• CVE-2026-29170: mod_proxy_ftp XSS (bsc#1267977).
• CVE-2026-33006: mod_auth_digest timing attack allows bypass of Digest authentication (bsc#1263955).
• CVE-2026-33007: NULL pointer dereference in mod_authn_socache allows unauthenticated remote user to crash a child processes (bsc#1263954).
• CVE-2026-33523: HTTP response splitting forwarding malicious status line (bsc#1263953).
• CVE-2026-33857: off-by-one OOB reads in AJP getter functions (bsc#1263952).
• CVE-2026-34032: heap buffer overread in mod_proxy_ajp due to missing null-termination check (bsc#1263951).
• CVE-2026-34059: heap buffer overread and memory disclosure via ajp_parse_data() (bsc#1263950).
• CVE-2026-34355: mod_proxy_html buffer overflow (bsc#1267978).
• CVE-2026-34356: malicious backend servers can lead to a heap-based buffer overflow (bsc#1267955).
• CVE-2026-42535: malicious path manipulation can lead to child process crashes (bsc#1267956).
• CVE-2026-42536: processing untrusted content can lead to a heap-based buffer overflow (bsc#1267962).
• CVE-2026-43951: out-of-bound read in merge_response_headers can cause crash (bsc#1267963).
• CVE-2026-44119: improper privilege management can lead to an unauthorized read (bsc#1267965).
• CVE-2026-44185: Stack Buffer Over-Read in mod_ssl OCSP send_request (bsc#1267969).
• CVE-2026-44186: responses from an attacker-controlled FTP backend can lead to resource exhaustion and a denial of service (bsc#1267970).
• CVE-2026-44631: crafted regular expression can lead to a buffer underwrite (bsc#1267971).
• CVE-2026-48913: file handle exhaustion during request processing in mod_http2 can lead to a use-after-free (bsc#1267972).
• CVE-2026-49975: Fix cookie header accounting against LimitRequestFields (bsc#1267503).

Non security issue:

• Update to 2.4.66 (jsc#PED-16334).

Marc Stern discovered that the Apache HTTP Server incorrectly handled serving WebSocket protocol upgrades over HTTP/2 connections. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2024-36387)

Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly sent certain request URLs with incorrect encodings to backends. A remote attacker could possibly use this issue to bypass authentication. (CVE-2024-38473)

Orange Tsai discovered that the Apache HTTP Server mod_rewrite module incorrectly handled certain substitutions. A remote attacker could possibly use this issue to execute scripts in directories not directly reachable by any URL, or cause a denial of service. Some environments may require using the new UnsafeAllow3F flag to handle unsafe substitutions. (CVE-2024-38474, CVE-2024-38475, CVE-2024-39573)

Orange Tsai discovered that the Apache HTTP Server incorrectly handled certain response headers. A remote attacker could possibly use this issue to obtain sensitive information, execute local scripts, or perform SSRF attacks. (CVE-2024-38476)

Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain requests. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2024-38477)

It was discovered that the Apache HTTP Server incorrectly handled certain handlers configured via AddType. A remote attacker could possibly use this issue to obtain source code. (CVE-2024-39884)

USN-6885-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

Orange Tsai discovered that the Apache HTTP Server mod_rewrite module incorrectly handled certain substitutions. A remote attacker could possibly use this issue to execute scripts in directories not directly reachable by any URL, or cause a denial of service. Some environments may require using the new UnsafeAllow3F flag to handle unsafe substitutions. (CVE-2024-38474, CVE-2024-38475)

Orange Tsai discovered that the Apache HTTP Server incorrectly handled certain response headers. A remote attacker could possibly use this issue to obtain sensitive information, execute local scripts, or perform SSRF attacks. (CVE-2024-38476)

Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain requests. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2024-38477)

It was discovered that Apache HTTP Server incorrectly handled certain response headers. An attacker could possibly use this issue to perform HTTP response splitting attacks. This issue only affected Ubuntu 14.04 LTS. (CVE-2023-38709)

Will Dormann and David Warren discovered that Apache HTTP Server's HTTP/2 implementation did not properly reclaim memory when streams were reset by clients. A remote attacker could possibly use this issue to cause Apache HTTP Server to consume resources, leading to a denial of service. This issue only affected Ubuntu 18.04 LTS. (CVE-2023-45802)

Keran Mu and Jianjun Chen discovered that Apache HTTP Server incorrectly handled certain response headers. An attacker could possibly use this issue to perform HTTP response splitting attacks. This issue only affected Ubuntu 14.04 LTS. (CVE-2024-24795)

Orange Tsai discovered that Apache HTTP Server mod_proxy incorrectly handled URL encoding. A remote attacker could possibly use this issue to bypass authentication via crafted requests. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2024-38473)

Orange Tsai discovered that Apache HTTP Server could be caused to perform server-side request forgery (SSRF) via malicious backend response headers. A remote attacker could possibly use this issue to conduct SSRF attacks or disclose sensitive information. This issue only affected Ubuntu 14.04 LTS. (CVE-2024-38476)

Orange Tsai discovered that Apache HTTP Server mod_proxy did not properly handle certain null pointer conditions. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2024-38477)

Orange Tsai discovered that Apache HTTP Server mod_rewrite could be made to perform server-side request forgery (SSRF) via unsafe RewriteRules. A remote attacker could possibly use this issue to conduct SSRF attacks. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2024-39573)

It was discovered that Apache HTTP Server incorrectly handled certain response headers. An attacker could possibly use this issue to perform HTTP response splitting attacks. This issue only affected Ubuntu 14.04 LTS. (CVE-2024-42516)

It was discovered that Apache HTTP Server could be caused to perform server-side request forgery (SSRF) via mod_headers modifying Content-Type headers. A remote attacker could possibly use this issue to conduct SSRF attacks. This issue only affected Ubuntu 14.04 LTS. (CVE-2024-43204)

John Runyon discovered that Apache HTTP Server mod_ssl did not properly escape user-supplied data before writing log entries. A remote attacker could possibly use this issue to insert escape sequences into log files. This issue only affected Ubuntu 14.04 LTS. (CVE-2024-47252)

Robert Merget discovered that Apache HTTP Server with SSLEngine optional was vulnerable to HTTP desynchronisation attacks. An attacker in a privileged network position could possibly use this issue to hijack HTTP sessions. This issue only affected Ubuntu 14.04 LTS. (CVE-2025-49812)

It was discovered that Apache HTTP Server mod_md had an integer overflow in the ACME certificate renewal backoff timer. An attacker could possibly use this issue to cause excessive certificate renewal requests. This issue only affected Ubuntu 20.04 LTS. (CVE-2025-55753)

Anthony Parfenov discovered that Apache HTTP Server with SSI enabled and mod_cgid passed shell-escaped query strings to #exec cmd directives. A remote attacker could possibly use this issue to perform command injection. (CVE-2025-58098)

Mattias Åsander discovered that Apache HTTP Server incorrectly gave precedence to environment variables from HTTP headers over server-calculated CGI variables. A remote attacker could possibly use this issue to influence the environment of CGI programs. (CVE-2025-65082)

Mattias Åsander discovered that Apache HTTP Server mod_userdir with suexec could be caused to run CGI scripts under…