PT-2026-54708 · Cisco · Cisco Secure Endpoint

Barteq + 2 · Published 2026-07-01 · Updated 2026-07-02 · CVE-2026-20243

NVD

CVSS v3.1

7.5

High

Base vector

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

A vulnerability in the ALZ 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 ALZ 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 ALZ content 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.

Fix

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

CVE-2026-20243

Affected Products

Cisco Secure Endpoint

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-20243 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR · Vendor Advisory
• https://twitter.com/techepages/status/2072614506300420195 · Twitter Post