CVE-2021-40438

critical-risk
Published 2021-09-16

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.

Do I need to act?

!
94.4% chance of exploitation in next 30 days
EPSS score — higher than 6% of all CVEs
!
CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.0/10 Critical
NETWORK / HIGH complexity

Affected Products (20)

Affected Vendors

Debian Redhat Apache Oracle Siemens Broadcom F5 Fedoraproject Netapp Tenable Resf

References (39)

Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
Release Notes https://httpd.apache.org/security/vulnerabilities_24.html
Mailing List https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e8494...
Mailing List https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d1104379...
Mailing List https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a14...
Mailing List https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156...
Mailing List https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b318...
Mailing List https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c...
Mailing List https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a78899778565...
Mailing List https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html
Release Notes https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Release Notes https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://security.gentoo.org/glsa/202208-20
Third Party Advisory https://security.netapp.com/advisory/ntap-20211008-0004/
Broken Link https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-a...
Mailing List https://www.debian.org/security/2021/dsa-4982
Patch https://www.oracle.com/security-alerts/cpuapr2022.html
Patch https://www.oracle.com/security-alerts/cpujan2022.html
Third Party Advisory https://www.tenable.com/security/tns-2021-17
Third Party Advisory https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
and 19 more references
82
/ 100
critical-risk
Severity 26/34 · High
Exploitability 27/34 · High
Exposure 29/34 · Critical