Home > Vulnerability Database > CVE-2021-41773

Mend.io Vulnerability Database

CVE-2021-41773

Good to know:

Date: October 5, 2021

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. 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 is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

Language: C

Severity Score

7.5

Related Resources (33)

Url: https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E

Url: http://www.openwall.com/lists/oss-security/2021/10/11/4

Url: http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal-Remote-Code-Execution.html

Url: http://www.openwall.com/lists/oss-security/2021/10/15/3

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-41773

Url: https://httpd.apache.org/security/vulnerabilities_24.html

Url: http://www.openwall.com/lists/oss-security/2021/10/16/1

Url: http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html

Url: https://security.netapp.com/advisory/ntap-20211029-0009/

Url: https://www.oracle.com/security-alerts/cpujan2022.html

Url: https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E

Url: https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebdd79ce84b042df45@%3Cannounce.apache.org%3E

Url: http://www.openwall.com/lists/oss-security/2021/10/08/2

Url: http://www.openwall.com/lists/oss-security/2021/10/09/1

Url: http://www.openwall.com/lists/oss-security/2021/10/08/1

Url: http://www.openwall.com/lists/oss-security/2021/10/08/4

Url: http://www.openwall.com/lists/oss-security/2021/10/08/3

Url: http://www.openwall.com/lists/oss-security/2021/10/08/6

Url: http://www.openwall.com/lists/oss-security/2021/10/07/6

Url: http://www.openwall.com/lists/oss-security/2021/10/08/5

Url: http://www.openwall.com/lists/oss-security/2021/10/07/1

Url: http://www.openwall.com/lists/oss-security/2021/10/05/2

Url: https://security.alpinelinux.org/vuln/CVE-2021-41773

Url: https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E

Url: https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78cb2338aee18982f@%3Cusers.httpd.apache.org%3E

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/

Url: https://security-tracker.debian.org/tracker/CVE-2021-41773

Url: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ

Url: http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Traversal.html

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/

Url: https://security.gentoo.org/glsa/202208-20

Url: http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html

Url: https://www.mend.io/vulnerability-database/CVE-2021-41773

Severity Score

7.5

Weakness Type (CWE)

Path Traversal

CWE-22

Top Fix

Upgrade Version

Upgrade to version 2.4.51

Learn More

CVSS v3.1

Base Score:	7.5
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	NONE
Availability (A):	NONE

CVSS v2

Base Score:	4.3
Access Vector (AV):	NETWORK
Access Complexity (AC):	MEDIUM
Authentication (AU):	NONE
Confidentiality (C):	PARTIAL
Integrity (I):	NONE
Availability (A):	NONE
Additional information:

Mend.io Vulnerability Database

We found results for “”

CVE-2021-41773

Good to know:

Date: October 5, 2021

Language: C

Severity Score

Related Resources (33)

Severity Score

Weakness Type (CWE)

Top Fix

Upgrade Version

CVSS v3.1

CVSS v2

Do you need more information?