CVE-2020-13671
Published: January 18, 2022
Official Description
Improper sanitization in the extension file names is present in Drupal core.
CISA KEV Advisory
Drupal core Un-restricted Upload of File
Improper sanitization in the extension file names is present in Drupal core.
Apply updates per vendor instructions.
Risk Analysis
Drupal core contains improper sanitization of extension file names, which could lead to various security issues. Its inclusion in CISA's KEV catalog and an EPSS score of 0.04504 indicate a significant and urgent risk of active exploitation.
This vulnerability is actively exploited in the wild, as confirmed by its presence in CISA's KEV catalog. Exploitation typically involves uploading malicious files.
Drupal administrators should update their Drupal core installation to a version that addresses the improper sanitization of extension file names. Implement strict file upload validation and sanitization practices.
Technical Analysis
CVE-2020-13671 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2020-13671 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-13671 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1