Critical severity9.8CISA KEVNVD Advisory· Published Oct 7, 2021· Updated Jun 17, 2026
CVE-2021-42013
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
14cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
- cpe:2.3:a:apache:http_server:2.4.50:*:*:*:*:*:*:*
- (no CPE)range: 2.4.49, 2.4.50
- (no CPE)range: Apache HTTP Server 2.4.49
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:*:*:*:*:*:*:*:*Range: <9.2.6.0
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- osv-coords2 versions
>= 2.4.49, < 2.4.50+ 1 more
- (no CPE)range: >= 2.4.49, < 2.4.50
- (no CPE)range: < 2.4.51-1.1
Patches
Vulnerability mechanics
References
31- lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3EnvdMailing ListPatch
- www.oracle.com/security-alerts/cpuapr2022.htmlnvdPatchThird Party Advisory
- www.oracle.com/security-alerts/cpujan2022.htmlnvdPatchThird Party Advisory
- packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.htmlnvdExploitThird Party AdvisoryVDB Entry
- www.povilaika.com/apache-2-4-50-exploit/nvdExploitThird Party Advisory
- jvn.jp/en/jp/JVN51106450/index.htmlnvdThird Party Advisory
- packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.htmlnvdThird Party AdvisoryVDB Entry
- www.openwall.com/lists/oss-security/2021/10/07/6nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/08/1nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/08/2nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/08/3nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/08/4nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/08/5nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/08/6nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/09/1nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/11/4nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/15/3nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/10/16/1nvdMailing ListThird Party Advisory
- httpd.apache.org/security/vulnerabilities_24.htmlnvdRelease NotesVendor Advisory
- security.gentoo.org/glsa/202208-20nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20211029-0009/nvdThird Party Advisory
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZnvdThird Party Advisory
- lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3EnvdMailing List
- lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3EnvdMailing List
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/nvdRelease Notes
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/nvdRelease Notes
- www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource
News mentions
1- RondoDox: From Targeting Pwn2Own Vulnerabilities to Shotgunning ExploitsTrend Micro Research · Oct 9, 2025