CVEvulnerability

CVE-2021-42013

9.8 CRITICAL Known exploited Published 2021-10-07 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Apache HTTP Server Path Traversal Vulnerability — Apache HTTP Server

Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default require all denied or if CGI scripts are enabled. This CVE ID resolves an incomplete patch for CVE-2021-41773.

Added to KEV: 2021-11-03
Remediation due: 2021-11-17
Ransomware use: Known
Required action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-42013

Status: Analyzed
Published: 2021-10-07
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected]): 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
Weaknesses: CWE-22

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 configurations

• apache http server 2.4.49 • apache http server 2.4.50 • fedoraproject fedora 34 • fedoraproject fedora 35 • oracle instantis enterprisetrack 17.1 • oracle instantis enterprisetrack 17.2 • oracle instantis enterprisetrack 17.3 • oracle jd edwards enterpriseone tools (< 9.2.6.0) • oracle secure backup (< 18.1.0.1.0) • netapp cloud backup

Related

Weakness · CWE (1)

CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness

References

http://jvn.jp/en/jp/JVN51106450/index.html Third Party Advisory
http://packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/10/07/6 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/1 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/2 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/3 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/4 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/5 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/6 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/09/1 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/11/4 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/15/3 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/16/1 Mailing List, Third Party Advisory
https://httpd.apache.org/security/vulnerabilities_24.html Release Notes, Vendor Advisory
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E Mailing List, Patch
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E Mailing List
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ Release Notes
https://security.gentoo.org/glsa/202208-20 Third Party Advisory
https://security.netapp.com/advisory/ntap-20211029-0009/ Third Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
https://www.povilaika.com/apache-2-4-50-exploit/ Exploit, Third Party Advisory
http://jvn.jp/en/jp/JVN51106450/index.html Third Party Advisory
http://packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html Third Party Advisory, VDB Entry
http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html Exploit, Third Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2021/10/07/6 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/1 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/2 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/3 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/4 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/5 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/08/6 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/09/1 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/11/4 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/15/3 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/16/1 Mailing List, Third Party Advisory
https://httpd.apache.org/security/vulnerabilities_24.html Release Notes, Vendor Advisory
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E Mailing List, Patch
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E Mailing List
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/ Release Notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/ Release Notes
https://security.gentoo.org/glsa/202208-20 Third Party Advisory
https://security.netapp.com/advisory/ntap-20211029-0009/ Third Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html Patch, Third Party Advisory
https://www.povilaika.com/apache-2-4-50-exploit/ Exploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42013 US Government Resource