VULNERABILITY INTELLIGENCE
CVE-2021-42013
CVSS score9.8 CRITICAL
EPSS probability99.96%
CISA KEVKnown exploited vulnerability
Published2021-10-07
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Known Exploited Vulnerability
Apache HTTP Server Path Traversal Vulnerability
Vendor / product: Apache / HTTP Server
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.
Weakness classification
- security@apache.org: CWE-22
- nvd@nist.gov: CWE-22
Primary references
- security@apache.org — Third Party Advisory
- security@apache.org — Exploit, Third Party Advisory, VDB Entry
- security@apache.org — Exploit, Third Party Advisory, VDB Entry
- security@apache.org — Exploit, Third Party Advisory, VDB Entry
- security@apache.org — Exploit, Third Party Advisory, VDB Entry
- security@apache.org — Third Party Advisory, VDB Entry
- security@apache.org — Exploit, Third Party Advisory, VDB Entry
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Mailing List, Third Party Advisory
- security@apache.org — Mailing List, Third Party Advisory