CVE-2021-40438

🔥 Known Exploited (CISA KEV)CRITICAL

9.0

CVSS Severity Score

EPSS Score67.9780%

EPSS Percentile87.84th

Published2021-09-16

Last Modified2025-10-27

Data SourcesNVDCISA KEVFIRST.org EPSS

Vulnerability Description

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 Platforms (CPE)

💻

Resf

Rocky Linux

= 8.0

💻

Redhat

Enterprise Linux

= 8.0

💻

Redhat

Enterprise Linux Eus

= 8.1= 8.2= 8.4= 8.6= 8.8

💻

Redhat

Enterprise Linux For Arm 64

= 8.0

References & Advisories

🔗 https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf

🔗 https://httpd.apache.org/security/vulnerabilities_24.html

🔗 https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E

🔗 https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E

🔗 https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E

🔗 https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E

🔗 https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E

🔗 https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E

Vulnerability Description

Affected Platforms (CPE)

Rocky Linux

Enterprise Linux

Enterprise Linux Eus

Enterprise Linux For Arm 64

References & Advisories

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