🛡️ CVE-2021-40438 — apache

🔴 CVSS 9.5 — Critical ✅ No Known Exploit OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

mod_proxy SSRF

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.

Affected software

CVE-2021-40438 is recorded against 1 package.

  • apache

Timeline and source

Published on 6 March 2024 and last revised on 22 October 2025. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

cert-portal.siemens.com (Web)
httpd.apache.org (Web)
lists.apache.org (Web)
lists.apache.org (Web)
lists.apache.org (Web)
lists.apache.org (Web)
lists.apache.org (Web)
lists.apache.org (Web)
lists.apache.org (Web)
lists.debian.org (Web)
lists.fedoraproject.org (Web)
lists.fedoraproject.org (Web)
security.gentoo.org (Web)
security.netapp.com (Web)
tools.cisco.com (Web)

CVE-2021-40438 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2024-03-06
Updated 2026-08-12
Modified 2025-10-22
Fix URL N/A

Affected Packages

Software From version Fixed in
apache

References

Similar Threats

Exploit Protection

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