CVE-2025-20234

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 .
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
ciscoCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA-ADPADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 37%
VendorProductVersion
clamavclamav
1.2.0 ≤
𝑥
< 1.4.3
ciscosecure_endpoint
𝑥
< 1.26.1
ciscosecure_endpoint
𝑥
< 1.26.1
ciscosecure_endpoint
𝑥
< 7.5.21
ciscosecure_endpoint
8.0.1.21160 ≤
𝑥
< 8.4.5
ciscosecure_endpoint_private_cloud
𝑥
< 4.2.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
clamav
bullseye
0.103.10+dfsg-0+deb11u1
not-affected
bookworm
1.0.9+dfsg-1~deb12u1
not-affected
bullseye (security)
1.0.9+dfsg-1~deb11u1
fixed
forky
1.4.3+dfsg-1
fixed
sid
1.4.3+dfsg-1
fixed
trixie
1.4.3+dfsg-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
clamav
plucky
Fixed 1.4.3+dfsg-0ubuntu0.25.04.1
released
oracular
Fixed 1.4.3+dfsg-0ubuntu0.24.10.1
released
noble
Fixed 1.4.3+dfsg-0ubuntu0.24.04.1
released
jammy
Fixed 1.4.3+dfsg-0ubuntu0.22.04.1
released
focal
Fixed 1.4.3+dfsg-0ubuntu0.20.04.1+esm1
released
bionic
not-affected
xenial
not-affected
trusty
not-affected
Common Weakness Enumeration
References
https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy