DoS Vulnerability in ClamAV Affects PESpin File Format Parsing
CVE-2026-20339

7.5HIGH

Key Information:

Vendor

Cisco
Status
Cisco Secure Endpoint
Vendor
CVE Published:
7 August 2026

Badges

👾 Exploit Exists

What is CVE-2026-20339?

A flaw in ClamAV's PESpin file format parser can lead to denial of service by allowing an unauthenticated remote attacker to exploit improper boundary checks. This can cause memory corruption and potential termination of the scanning process. By sending a specially crafted PESpin file for scanning, an attacker could trigger an integer overflow, compromising the functionality of ClamAV and affecting the software's operational reliability.

Affected Version(s)

Cisco Secure Endpoint 7.0.5

Cisco Secure Endpoint 6.2.19

Cisco Secure Endpoint 7.3.3

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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