November 13, 2026

CVE Watchtower

CVE-2025-20234Clamav Clamav Out-of-bounds Read

NVDCVSS scored by psirt@cisco.com

Vulnerability Summary

A vulnerability in Universal Disk Format (UDF) processing of ClamAV could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.

This vulnerability is due to a memory overread during UDF file scanning. An attacker could exploit this vulnerability by submitting a crafted file containing UDF content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to terminate the ClamAV scanning process, resulting in a DoS condition on the affected software.
For a description of this vulnerability, see the .
Severity Level
MEDIUM(5.3)
Published Date
Jun 18, 2025
Last Modified
Aug 11, 2025
Exploitation Status
No confirmed exploitation yet
Root Weakness (CWE)
CWE-125: Out-of-bounds Read β†—
The software reads data past the end, or before the beginning, of the intended buffer.
CVSS v3.1 Base Metrics — Score 5.3 (MEDIUM)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityLow

Affected & Patched Versions

Affected Versions
  • Clamav Clamav >= 1.2.0 and < 1.4.3
  • Cisco Secure Endpoint < 1.26.1
  • Cisco Secure Endpoint < 7.5.21
  • Cisco Secure Endpoint >= 8.0.1.21160 and < 8.4.5
  • Cisco Secure Endpoint Private Cloud < 4.2.2
Patched Versions
  • Clamav Clamav 1.4.3
  • Cisco Secure Endpoint 1.26.1
  • Cisco Secure Endpoint 7.5.21
  • Cisco Secure Endpoint 8.4.5
  • Cisco Secure Endpoint Private Cloud 4.2.2

What to do

Fix it during your normal patch cycle. No exploitation is confirmed yet.

  1. Check whether you run Clamav Clamav and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Jun 18, 2025Published
  • Aug 11, 2025Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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Related Coverage

External References

Data last checked: Nov 13, 2026 11:13 (site time)