Description
A vulnerability in the PE 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 PE 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 PE 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.
Published: 2026-07-01
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

The vulnerability involves an out-of-bounds buffer write in ClamAV’s PE file parser. By supplying a crafted PE file to the scanning engine, an unauthenticated, remote attacker can trigger a memory corruption that causes the ClamAV process to terminate. other impacts may also be possible.

Affected Systems

Cisco Secure Endpoint devices that bundle the ClamAV antivirus engine are affected. No specific product version in Secure Endpoint is considered vulnerable until the official patch is applied.

Risk and Exploitability

The CVSS score of 7.5 indicates high severity. The EPSS score is below 1%, meaning the exploitation probability is low but non-zero. The vulnerability is not listed in CISA’s KEV catalog. Attackers can trigger it remotely by sending a malicious PE file to the scanner, requiring no privileged access. Once triggered, the ClamAV process crashes, leading to a denial of service on the affected host or service.

Generated by OpenCVE AI on August 1, 2026 at 22:57 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest Cisco Secure Endpoint release that includes the patched ClamAV PE parser, which adds proper bounds checking to mitigate CWE-120 and CWE-787 vulnerabilities.
  • If a patch is not yet available, reconfigure the scanner to ignore or quarantine PE files to avoid executing the vulnerable parsing code that can trigger an out-of-bounds write as described by CWE-120/CWE-787.
  • Monitor ClamAV logs and process health and consider reducing scan frequency or disabling automatic scans temporarily until a patch is deployed.

Generated by OpenCVE AI on August 1, 2026 at 22:57 UTC.

Tracking

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Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8517-1 ClamAV vulnerabilities
History

Sat, 04 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics threat_severity

None

 threat_severity

Important

Thu, 02 Jul 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco secure Endpoint
Vendors & Products Cisco
Cisco secure Endpoint

Wed, 01 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 01 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Description A vulnerability in the PE 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 PE 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 PE 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.
Title ClamAV PE File Format Processing Out-of-Bounds Memory Corruption Vulnerability
Weaknesses CWE-120
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

Cisco Secure Endpoint
Clamav Clamav
cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-07-01T17:25:08.998Z

Reserved: 2025-10-08T11:59:15.398Z

Link: CVE-2026-20213

cve-icon Vulnrichment

Updated: 2026-07-01T17:21:04.441Z

cve-icon NVD

Status : Analyzed

Published: 2026-07-01T17:16:29.460

Modified: 2026-07-09T17:56:55.537

Link: CVE-2026-20213

cve-icon Redhat

Severity : Important

Publid Date: 2026-07-01T16:27:38Z

Links: CVE-2026-20213 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-01T23:00:05Z

Weaknesses
  • CWE-120

    Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

  • CWE-787

    Out-of-bounds Write