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CVE-2025-20128

ClamAV OLE2 File Format Decryption Denial of Service Vulnerability

Published: Jan 22, 2025Updated: Nov 3, 2025 Sources: CVE List NVD BDUCWE-122
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
1.5%
Top 28.9%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

Description

A vulnerability in the Object Linking and Embedding 2 (OLE2) decryption routine 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 an integer underflow in a bounds check that allows for a heap buffer overflow read. An attacker could exploit this vulnerability by submitting a crafted file containing OLE2 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 . Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-122

Affected Products

Cisco Secure EndpointCisco
On-prem
Networking Infrastructure / router-switch
clamavclamav
On-premSecurity Product
Security Products / vuln-mgmt-scanner
secure endpointcisco
On-prem
Networking Infrastructure / router-switch
secure endpoint private cloudcisco
On-prem
Networking Infrastructure / router-switch
Clam AntivirusCisco Systems Inc.
On-prem
Networking Infrastructure / router-switch
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.
clamavoss-projectSecurity Productsaka clambc, clamav
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco
and 2 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-ole2-H549rphA
sec.cloudapps.cisco.com
https://blog.clamav.net/2025/01/clamav-142-and-108-security-patch.html
blog.clamav.net
https://lists.debian.org/debian-lts-announce/2025/09/msg00006.html
lists.debian.org
and 1 more references View all →

Timeline

Published
Jan 22, 2025
Last Updated
Nov 3, 2025

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