What’s Vulnerable › Vulnerabilities
CVE-2026-20217: ClamAV PESpin File Format Processing Out-of-Bounds Memory Corruption Vulnerability
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-01 · updated 2026-10-25
- Weakness: CWE-120
Description
A vulnerability in the PESpin 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 PESpin 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 PESpin 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.
Affected products
- Cisco Secure Endpoint: before 1.27.2; before 1.29.0; before 8.6.2 — fixed in 1.27.2, 1.29.0, 8.6.2
- Cisco ClamAV: before 1.4.5; from 1.5.0 before 1.5.3 — fixed in 1.4.5, 1.5.3
How to fix
Upgrade to a fixed version: Cisco Secure Endpoint 1.27.2, 1.29.0, 8.6.2; Cisco ClamAV 1.4.5, 1.5.3. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-20217 or the next vulnerability affects your stack