CVE-2026-20338

HIGH · CVSS 7.5 · EPSS 0.33% · CWE CWE-415

A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software.

CVE-2026-20338 is confirmed by Cisco as affecting 6 products, including Cisco Secure Endpoint, Cisco Adaptive Security Appliance (ASA) Software, and Cisco Firepower Management Center, and 3 more, via 1 advisory (CVSS 7.5; EPSS 0.3%).

6 products with CSAF evidence