DoS Vulnerability in ClamAV's Mach-O File Format Parser
CVE-2026-20347

7.5HIGH

Key Information:

Vendor

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

Badges

👾 Exploit Exists

What is CVE-2026-20347?

A flaw exists in ClamAV's Mach-O file format parser that may allow an unauthenticated remote attacker to exploit memory corruption vulnerabilities. This potential exploitation can lead to a Denial of Service condition, causing the ClamAV scanning process to unexpectedly terminate. The issue arises from improper boundary checks when scanning Mach-O files. Attackers can leverage this vulnerability by providing a specially crafted Mach-O file, which when processed by ClamAV, could lead to out-of-bounds buffer reads and subsequent application failure.

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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