CVE-2026-20347

HIGH · CVSS 7.5 · EPSS 0.33% · CWE CWE-125

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.

CVE-2026-20347 is confirmed by Cisco as affecting 9 products, including Cisco Secure Endpoint, Cisco Adaptive Security Appliance (ASA) Software, and Cisco Catalyst SD-WAN Manager, and 6 more, via 1 advisory (CVSS 7.5; EPSS 0.3%).

9 products with CSAF evidence