CVE-2026-20214 HIGH

CVE-2026-20214: ClamAV FSG File Format Processing Out-of-Bounds Memory Corruption Vulnerability

Vendor Cisco
Product Cisco Secure Endpoint
Weakness CWE-120
Published July 1, 2026
Last update July 1, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

A vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in FSG files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains portable executable content compressed with FSG to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

Key dates

02Disclosure timeline

July 1, 2026 CVE published
July 1, 2026 Record updated