CVE-2026-20347: Cisco Secure Endpoint

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability in the Mach-O file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in Mach-O files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted Mach-O file 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.

Affected products

• Cisco Cisco Secure Endpoint: version 7.0.5 only; version 6.2.19 only; version 7.3.3 only; version 7.2.13 only; version 6.1.5 only; version 6.3.1 only; …

Published 2026-08-07. Last modified 2026-08-11.