What is CVE-2025-20260?

CVE-2025-20260 is a critical-severity vulnerability in Cisco Clamav, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-06-18.

How severe is CVE-2025-20260?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-20260 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Cisco Clamav

CVE-2025-20260

A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device. Th…

Vulnerability class: Buffer Overflow

EPSS: 0.012 (79.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cisco Clamav — versions 1.4.2, 1.4.1, 1.4.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

References

clamav-143-and-109-security-patch

Frequently asked questions

What is CVE-2025-20260?: CVE-2025-20260 is a critical-severity vulnerability in Cisco Clamav, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2025-06-18.
How severe is CVE-2025-20260?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-20260 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.