CVE-2021-40438
CRITICALCVSS 9.0Known ExploitedCISA Known Exploited Vulnerability
https://nvd.nist.gov/vuln/detail/CVE-2021-40438
Remediation deadline: December 15, 2021
Ransomware use: Known
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.
Timeline
Published:September 16th, 2021 3:15 PM
Last modified:August 1st, 2026 5:16 AM
Added to KEV:December 1st, 2021
CVSS Scoring
CVSS v3: 9.0 (CRITICAL)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v2: 6.8
Affected Software
From NVD CPE configuration data
Vendors
resfredhatapachefedoraprojectdebiannetappbroadcomf5oraclesiemenstenable
Products
rocky_linuxenterprise_linuxenterprise_linux_eusenterprise_linux_for_arm_64enterprise_linux_for_arm_64_eusenterprise_linux_for_ibm_z_systemsenterprise_linux_for_ibm_z_systems_eusenterprise_linux_for_ibm_z_systems_eus_s390xenterprise_linux_for_power_big_endianenterprise_linux_for_power_little_endianenterprise_linux_for_power_little_endian_eusenterprise_linux_for_scientific_computingenterprise_linux_serverenterprise_linux_server_ausenterprise_linux_server_for_power_little_endian_update_services_for_sap_solutionsenterprise_linux_server_tusenterprise_linux_server_update_services_for_sap_solutionsenterprise_linux_update_services_for_sap_solutionsenterprise_linux_workstationjboss_core_services
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdfThird Party Advisory
- https://httpd.apache.org/security/vulnerabilities_24.htmlRelease Notes
- https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.debian.org/debian-lts-announce/2021/10/msg00001.htmlMailing List
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/Release Notes
- https://security.gentoo.org/glsa/202208-20Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211008-0004/Third Party Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQBroken Link
- https://www.debian.org/security/2021/dsa-4982Mailing List
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch
- https://www.tenable.com/security/tns-2021-17Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdfThird Party Advisory
- https://httpd.apache.org/security/vulnerabilities_24.htmlRelease Notes
- https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3EMailing List
- https://lists.debian.org/debian-lts-announce/2021/10/msg00001.htmlMailing List
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/Release Notes
- https://security.gentoo.org/glsa/202208-20Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211008-0004/Third Party Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQBroken Link
- https://www.debian.org/security/2021/dsa-4982Mailing List
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch
- https://www.tenable.com/security/tns-2021-17Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40438US Government Resource
Source: NIST NVD · Data may lag official sources by up to one minute