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7.5
CVE-2026-20339
Cisco · Cisco Secure Endpoint

ClamAV PESpin File Format Processing Integer Overflow Vulnerability

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 as a result of 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 integer overflow. 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

VendorProductVersions
CiscoCisco Secure Endpoint7.0.5, 6.2.19, 7.3.3, 7.2.13, 6.1.5, 6.3.1, 6.2.5, 7.3.5, 6.2.1, 7.2.7, 7.1.1, 6.3.5, 6.2.9, 7.3.1, 6.1.7, 7.2.11, 7.2.3, 7.1.5, 6.3.3, 7.3.9, 6.2.3, 6.1.9, 6.0.9, 7.2.5, 6.0.7, 6.3.7, 1.12.3, 1.8.0, 1.11.1, 1.12.4, 1.10.0, 1.12.0, 1.8.1, 1.10.1, 1.12.1, 1.12.6, 1.14.0, 1.10.2, 1.12.7, 1.12.2, 1.6.0, 1.9.0, 1.11.0, 1.7.0, 1.13.0, 1.8.4, 1.13.1, 1.9.1, 1.12.5, 1.13.2, 8.1.7.21512, 8.1.7, 8.1.5, 8.1.3.21242, 8.1.3, 8.1.5.21322, 8.1.7.21417, 1.14.1, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.15.5, 1.15.6, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.18.0, 1.18.1, 1.20.0, 1.21.0, 1.21.1, 1.21.2, 1.21.3, 1.22.0, 1.22.1, 1.22.2, 1.22.3, 1.22.4, 1.24.0, 1.24.1, 1.24.2, 1.24.3, 1.24.4, 1.26.0, 1.24.5, 1.26.1, 1.27.0, 1.15.0, 1.17.0, 1.17.1, 1.17.2, 1.19.0, 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5, 1.20.6, 1.23.0, 1.23.1, 1.20.7, 1.20.8, 1.25.0, 1.25.1, 1.25.2, 1.27.1, 1.27.2, 7.3.13, 7.3.15, 7.4.1, 7.4.1.20425, 7.4.1.20439, 7.4.3, 7.4.3.20679, 7.4.5, 7.5.1.20813, 7.5.1.20833, 7.5.3, 7.5.5, 8.0.1.21160, 8.0.1.21164, 7.5.7, 7.5.9, 7.5.11, 8.1.7.21585, 7.5.13.21586, 7.5.13.21598, 8.2.1.21612, 8.2.1.21650, 7.5.15.21611, 7.5.17.21680, 8.2.3.30119, 8.2.4.30130, 8.4.0, 7.5.19, 8.4.1.30298, 8.4.2.30317, 8.4.1.30307, 7.5.20, 8.4.3, 8.4.4.30419, 8.4.4.30467, 7.5.21.21732, 8.4.5.30483

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
cissecurecert_advisory90%
open sourceclamavcert_advisory90%

References

  • https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26

Related News (5 articles)

Tier A
Microsoft MSRC1d ago
CVE-2026-20339 ClamAV PESpin File Format Processing Integer Overflow Vulnerability
→ No new info (linked only)
Tier D
SecurityWeek2d ago
Cisco Warns of High-Severity ClamAV Vulnerabilities With Public PoC
→ No new info (linked only)
Tier B
BSI Advisories2d ago
[NEU] [hoch] ClamAV: Mehrere Schwachstellen ermöglichen Denial of Service und Offenlegung von Informationen
→ No new info (linked only)
Tier B
CERT-FR2d ago
Multiples vulnérabilités dans ClamAV (10 août 2026)
→ No new info (linked only)
Tier C
VulDB5d ago
CVE-2026-20339 | ClamAV PESpin File Format Parser integer overflow
→ No new info (linked only)
CVSS 3.17.5 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA KEV❌ No
Actively exploited❌ No
CWECWE-190
PublishedAug 7, 2026
Last enriched5d ago
Trending Score52
Source articles5
Independent5
Info Completeness8/14
Missing: epss, kev, exploit, patch, iocs, mitre_attack

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Verification

State: verified
Confidence: 0%

Vulnerability Timeline

CVE Published
Aug 7, 2026
Discovered by ZDM
Aug 7, 2026