Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

• CISA KEV Listed since 3 Nov 2021: known to be exploited. CISA reports use in ransomware campaigns.
• EPSS 1.00, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 7 Oct 2021. New records show when each source confirmed them.

Sources

• CVE List: CVE-2021-42013
• NVD: CVE-2021-42013

References from the CNA

• httpd.apache.org/security/vulnerabilities_24.html
• lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E mailing-listmlist
• lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/07/6 mailing-listmlist
• tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ vendor-advisorycisco
• jvn.jp/en/jp/JVN51106450/index.html third-party-advisoryjvn
• www.openwall.com/lists/oss-security/2021/10/08/1 mailing-listmlist
• lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/08/2 mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/08/3 mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/08/4 mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/08/6 mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/08/5 mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/09/1 mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/11/4 mailing-listmlist
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ vendor-advisoryfedora
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ vendor-advisoryfedora
• www.openwall.com/lists/oss-security/2021/10/15/3 mailing-listmlist
• www.openwall.com/lists/oss-security/2021/10/16/1 mailing-listmlist
• www.oracle.com/security-alerts/cpujan2022.html
• security.netapp.com/advisory/ntap-20211029-0009/ confirm
• packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html
• packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html
• packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html
• packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html
• packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html
• www.oracle.com/security-alerts/cpuapr2022.html
• packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html
• www.povilaika.com/apache-2-4-50-exploit/
• security.gentoo.org/glsa/202208-20 vendor-advisorygentoo

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.