Apache2: Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack.
Certain mod_proxy configurations in Apache HTTP Server versions 2.4.0 through 2.4.55 allow HTTP Request Smuggling attacks when mod_proxy is enabled with RewriteRule or ProxyPassMatch directives using non-specific URL rewrite patterns. This vulnerability can lead to bypassing access controls, proxying unintended URLs, and cache poisoning. Upgrading to Apache HTTP Server version 2.4.56 or later mitigates this issue.
AI Analysis
Technical Summary
Apache HTTP Server versions 2.4.0 through 2.4.55 contain a vulnerability in mod_proxy configurations that use RewriteRule or ProxyPassMatch directives with non-specific patterns to rewrite user-supplied URLs. This flaw enables HTTP Request Smuggling attacks, which can bypass access controls, cause proxying of unintended URLs, and enable cache poisoning. The vulnerability affects multiple Ubuntu package versions of Apache2 as listed. Users are advised to upgrade to version 2.4.56 or later to address this issue.
Potential Impact
Successful exploitation of this vulnerability can allow attackers to bypass access controls, proxy unintended URLs, and poison caches, potentially leading to unauthorized access and manipulation of web traffic.
Mitigation Recommendations
A fix is available in Apache HTTP Server version 2.4.56 and later. Users should upgrade to version 2.4.56 or newer to mitigate this vulnerability.
Apache2: Some mod_proxy configurations on Apache HTTP Server versions 2.4.0 through 2.4.55 allow a HTTP Request Smuggling attack.
Description
Certain mod_proxy configurations in Apache HTTP Server versions 2.4.0 through 2.4.55 allow HTTP Request Smuggling attacks when mod_proxy is enabled with RewriteRule or ProxyPassMatch directives using non-specific URL rewrite patterns. This vulnerability can lead to bypassing access controls, proxying unintended URLs, and cache poisoning. Upgrading to Apache HTTP Server version 2.4.56 or later mitigates this issue.
CVSS v3.1
Score 9.8critical
Affected software
pkg:deb/ubuntu/[email protected]+esm15?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]+esm10?arch=source&distro=esm-infra/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=focalpkg:deb/ubuntu/[email protected]?arch=source&distro=jammyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Apache HTTP Server versions 2.4.0 through 2.4.55 contain a vulnerability in mod_proxy configurations that use RewriteRule or ProxyPassMatch directives with non-specific patterns to rewrite user-supplied URLs. This flaw enables HTTP Request Smuggling attacks, which can bypass access controls, cause proxying of unintended URLs, and enable cache poisoning. The vulnerability affects multiple Ubuntu package versions of Apache2 as listed. Users are advised to upgrade to version 2.4.56 or later to address this issue.
Potential Impact
Successful exploitation of this vulnerability can allow attackers to bypass access controls, proxy unintended URLs, and poison caches, potentially leading to unauthorized access and manipulation of web traffic.
Mitigation Recommendations
A fix is available in Apache HTTP Server version 2.4.56 and later. Users should upgrade to version 2.4.56 or newer to mitigate this vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2023-25690
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a6151299c2644c7f8da6dd2
Added to database: 07/22/2026, 23:24:25 UTC
Last enriched: 07/23/2026, 00:22:18 UTC
Last updated: 09/10/2026, 19:24:53 UTC
Views: 36
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