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.
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Wed, 22 Oct 2025 00:30:00 +0000
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Status: PUBLISHED
Assigner: apache
Published: 2021-10-05T08:40:12.000Z
Updated: 2025-10-21T23:25:30.864Z
Reserved: 2021-09-29T00:00:00.000Z
Link: CVE-2021-41773
Updated: 2024-08-04T03:15:29.280Z
Status : Modified
Published: 2021-10-05T09:15:07.593
Modified: 2025-10-22T00:17:46.360
Link: CVE-2021-41773