CVE-2021-22204
Published: November 17, 2021
Official Description
Improper neutralization of user data in the DjVu file format in Exiftool versions 7.44 and up allows arbitrary code execution when parsing the malicious image
CISA KEV Advisory
ExifTool Remote Code Execution Vulnerability
Improper neutralization of user data in the DjVu file format in Exiftool versions 7.44 and up allows arbitrary code execution when parsing the malicious image
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in Exiftool allows arbitrary code execution when parsing malicious DjVu image files due to improper neutralization of user data. Rated as HIGH severity with a very high EPSS score, this indicates a significant likelihood of exploitation. Its presence in CISA's KEV confirms it has been actively exploited.
This vulnerability has been actively exploited in the wild and is part of CISA's KEV, indicating confirmed real-world attacks. The flaw is triggered by parsing malicious image files.
Users should update Exiftool to a patched version beyond 7.44. Exercise caution when processing image files from untrusted sources.
Technical Analysis
CVE-2021-22204 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-2021-22204 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.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-22204 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