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CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49

High · CVSS 7.5 (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

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.

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