Live › vulnerability › CVE-2021-42013
Go to dashboardApache HTTP Server 2.4.49 and 2.4.50 let remote attackers traverse outside Alias-mapped directories to read files and, when CGI is enabled, run commands. The flaw is actively exploited and is listed in CISA's Known Exploited Vulnerabilities catalog with ransomware use noted.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
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| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Apache HTTP Server | vendor | – | – |
2.4.49 or 2.4.50Require all granted under Alias-mapped paths/.%2e/ or %2e%2e paths2.4.51 or later, which fixes CVE-2021-41773 and CVE-2021-42013Require all denied for the root directory and disable CGI where it is not neededEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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