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CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)
It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.
9.8 CRITICALEPSS 99.96%⚡ Known Exploited (CISA KEV)NVD: Published
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1CISA-ADP | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Details
- CVE ID
- CVE-2021-42013
- Status
- Published
- Assigner (CNA)
- apache
- Published
- Oct 7, 2021
- Last modified
- 2025-10-21 23:25 UTC
- Weaknesses
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Products
As published by the CNA in the CVE record.
Apache Software FoundationApache HTTP Server2 version ranges
- Apache HTTP Server 2.4.49
- Apache HTTP Server 2.4.50
References
- httpd.apache.org https://httpd.apache.org/security/vulnerabilities_24.html
- lists.apache.org https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E
- lists.apache.org https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/07/6
- tools.cisco.com https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ
- jvn.jp http://jvn.jp/en/jp/JVN51106450/index.html
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/08/1
- lists.apache.org https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/08/2
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/08/3
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/08/4
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/08/6
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/08/5
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/09/1
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/11/4
- lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/
- lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/15/3
- openwall.com http://www.openwall.com/lists/oss-security/2021/10/16/1
- oracle.com https://www.oracle.com/security-alerts/cpujan2022.html
- security.netapp.com https://security.netapp.com/advisory/ntap-20211029-0009/
- packetstormsecurity.com http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html
- packetstormsecurity.com http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html
- packetstormsecurity.com http://packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html
- packetstormsecurity.com http://packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html
- packetstormsecurity.com http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html
- oracle.com https://www.oracle.com/security-alerts/cpuapr2022.html
- packetstormsecurity.com http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html
- povilaika.com https://www.povilaika.com/apache-2-4-50-exploit/
- security.gentoo.org https://security.gentoo.org/glsa/202208-20
Sources
- NVD (unavailable at last refresh)
- CVE.org
- CISA KEV
- FIRST EPSS