Buffer overflow in Cisco Secure Endpoint
CVE-2026-20337
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 boundary checks for content in zip files during scanning, which may result in an out-of-bounds write condition. 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, resulting in a DoS condition on the affected software.
Vulnerability class: Buffer Overflow
EPSS: 0.005 (42.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Cisco Secure Endpoint — versions 7.0.5, 6.2.19, 7.3.3
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20337?
- CVE-2026-20337 is a high-severity vulnerability in Cisco Secure Endpoint, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-08-07.
- How severe is CVE-2026-20337?
- High severity. CVSS v3 base score is 7.5 out of 10.