High severity · published Jun 18, 2025
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…
7.5
CVSS
0.8%
EPSS
No
On KEV
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 .
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CL
Clamav · Clamav
1.2.0 before 1.4.3 · source: NVD
SE
Secure Endpoint · Cisco
before 1.26.1; before 1.26.1; before 7.5.21; 8.0.1.21160 before 8.4.5 · source: NVD
SE
Secure Endpoint Private Cloud · Cisco
before 4.2.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-20234
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-20234
Vendor Advisory
https://blog.clamav.net/2025/06/clamav-143-and-109-security-patch.html
Third Party Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy
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