CVE-2021-40438: mod_proxy SSRF
Critical · CVSS 9.0 (CVSS 3.1)KEV known exploitedEPSS 100.0%, 100th percentilePublished Updated Assigner: apache
In CISA’s Known Exploited Vulnerabilities catalog: Apache HTTP Server-Side Request Forgery (SSRF).
Added , federal remediation due . Known ransomware use: Known.
Required action: Apply updates per vendor instructions.
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.
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H · CWE-918
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Apache Software Foundation: Apache HTTP Server
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf (opens in new tab)
- httpd.apache.org/security/vulnerabilities_24.html (opens in new tab)
- lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a… (opens in new tab)
- lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37… (opens in new tab)
- lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432… (opens in new tab)
- lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c… (opens in new tab)
- lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697… (opens in new tab)
- lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029… (opens in new tab)
- lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00… (opens in new tab)
- lists.debian.org/debian-lts-announce/2021/10/msg00001.html (opens in new tab)
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR… (opens in new tab)
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCY… (opens in new tab)
- security.gentoo.org/glsa/202208-20 (opens in new tab)
- security.netapp.com/advisory/ntap-20211008-0004/ (opens in new tab)
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2… (opens in new tab)
- www.debian.org/security/2021/dsa-4982 (opens in new tab)
- www.oracle.com/security-alerts/cpuapr2022.html (opens in new tab)
- www.oracle.com/security-alerts/cpujan2022.html (opens in new tab)
- www.tenable.com/security/tns-2021-17 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)