CVE-2024-38475

CRITICAL9.1

CISA KEV

Published 2024-07-01 · Updated 2026-06-17 · Source security@apache.org

Summary

CVE-2024-38475 is a critical-severity (CVSS 9.1) vulnerability in Apache HTTP Server. CISA added it to the Known Exploited Vulnerabilities catalog on May 1, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 22, 2025. CISA does not currently list it as used in ransomware campaigns. Apache has 41 vulnerabilities in the KEV catalog, 8 of them linked to ransomware.

All 41 known-exploited Apache vulnerabilities →

Description

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.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE-116

CISA Known-Exploited Vulnerability

Product: Apache — HTTP Server

Name: Apache HTTP Server Improper Escaping of Output Vulnerability

Date added: 2025-05-01 · Due: 2025-05-22

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

View on NVD

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added 2025-02-04
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added 2024-09-18

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