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CVE-2021-42013: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)

Critical · CVSS 9.8 (CVSS 3.1)KEV known exploitedEPSS 100.0%, 100th percentilePublished Updated Assigner: apache

In CISA’s Known Exploited Vulnerabilities catalog: Apache HTTP Server Path Traversal Vulnerability.

Added , federal remediation due . Known ransomware use: Known.

Required action: Apply updates per vendor instructions.

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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · CWE-22

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Apache Software Foundation: Apache HTTP Server

References

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