CVE-2025-20234

ClamAV UDF File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

HIGH

7.5

CVSS Score

Published: June 18, 2025 at 04:20 PM UTC

Updated: June 17, 2026 at 08:41 AM UTC

3 products affected across 2 vendorsClamAVSecure EndpointSecure Endpoint Private Cloud

Using Cisco Secure Endpoint by Cisco?

Get instant alerts when new vulnerabilities affect Cisco Secure Endpoint - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.5

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

Description

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 .

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Secure Endpoint · Cisco

95%

v < 1.26.1v < 7.5.218.0.1.21160 ≤ v < 8.4.51.10.0 1.10.1 1.10.2 1.11.0 1.11.1 1.12.0 1.12.1 1.12.2 1.12.3 1.12.4 1.12.5 1.12.6 1.12.7 1.13.0 1.13.1 1.13.2 1.14.0 1.14.1 1.15.2 1.15.3 1.15.4 1.15.6 1.16.0 1.16.1 1.16.2 1.16.3 1.17.0 1.18.1 1.21.0 1.21.2 1.22.4 1.24.1 1.24.2 1.24.4 1.6.0 1.7.0 1.8.0 1.8.1 1.8.4 1.9.0 1.9.1 6.0.7 6.0.9 6.1.5 6.1.7 6.1.9 6.2.1 6.2.19 6.2.3 6.2.5 6.2.9 6.3.1 6.3.3 6.3.5 6.3.7 7.0.5 7.1.1 7.1.5 7.2.11 7.2.13 7.2.3 7.2.5 7.2.7 7.3.1 7.3.3 7.3.5 7.3.9 8.1.3 8.1.3.21242 8.1.5 8.1.5.21322 8.1.7 8.1.7.21417 8.1.7.21512

Affected range stops below 1.26.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.5.21, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.4.5, so it looks safe — our inference, not a vendor statement

Secure Endpoint Private Cloud · Cisco

95%

v < 4.2.2

Affected range stops below 4.2.2, so it looks safe — our inference, not a vendor statement

ClamAV · Clamav

95%

1.2.0 ≤ v < 1.4.3

Affected range stops below 1.4.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html

References (2)

Vendor Advisory

Source: [email protected]

https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html

Third Party Advisory

Source: [email protected]

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-125

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card