Unrated severityCISA KEVNVD Advisory· Published Oct 7, 2021· Updated Oct 21, 2025
Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)
CVE-2021-42013
Description
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.
Affected products
1- Apache Software Foundation/Apache HTTP Serverv5Range: Apache HTTP Server 2.4.49
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
30- jvn.jp/en/jp/JVN51106450/index.htmlmitrethird-party-advisoryx_refsource_JVN
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/mitrevendor-advisoryx_refsource_FEDORA
- security.gentoo.org/glsa/202208-20mitrevendor-advisoryx_refsource_GENTOO
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZmitrevendor-advisoryx_refsource_CISCO
- packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.htmlmitrex_refsource_MISC
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- packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.htmlmitrex_refsource_MISC
- packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.htmlmitrex_refsource_MISC
- packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.htmlmitrex_refsource_MISC
- packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.htmlmitrex_refsource_MISC
- www.openwall.com/lists/oss-security/2021/10/07/6mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/08/1mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/08/2mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/08/3mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/08/4mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/08/5mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/08/6mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/09/1mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/11/4mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/15/3mitremailing-listx_refsource_MLIST
- www.openwall.com/lists/oss-security/2021/10/16/1mitremailing-listx_refsource_MLIST
- httpd.apache.org/security/vulnerabilities_24.htmlmitrex_refsource_MISC
- lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3Emitremailing-listx_refsource_MLIST
- lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3Emitremailing-listx_refsource_MLIST
- lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3Emitremailing-listx_refsource_MLIST
- security.netapp.com/advisory/ntap-20211029-0009/mitrex_refsource_CONFIRM
- www.oracle.com/security-alerts/cpuapr2022.htmlmitrex_refsource_MISC
- www.oracle.com/security-alerts/cpujan2022.htmlmitrex_refsource_MISC
- www.povilaika.com/apache-2-4-50-exploit/mitrex_refsource_MISC
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