November 3, 2021 · Applied Cybernetics Group
CVE-2021-42013 — Apache HTTP Server
known ransomware use
Apache HTTP Server Path Traversal Vulnerability
- Added to KEV
2021-11-03- Federal due date
2021-11-17- Vendor
- Apache
- Product
- HTTP Server
- EPSS
- 100.0th percentile (score 1.000, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- ATT&CK
- T1059 , T1210 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2021-42013
CISA short description
Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default require all denied or if CGI scripts are enabled. This CVE ID resolves an incomplete patch for CVE-2021-41773.
Required action
Apply updates per vendor instructions.