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 ClamAV blog.

  Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-udf-hmwd9nDy

Affected Products

• The Vulnerable Products section of this advisory includes Cisco bug IDs for each affected product. The bugs are accessible through the Cisco Bug Search Tool and contain additional platform-specific information, including workarounds (if available) and fixed software releases.

  Vulnerable Products

  The following table lists Cisco products that are affected by the vulnerability that is described in this advisory. Customers should refer to the associated Cisco bug IDs for further details.

  Affected Cisco Software Platform	CVSS Base Score	Security Impact Rating	Cisco Bug ID	First Fixed Release
  Secure Endpoint Connector for Linux	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	Medium	CSCwo45640	1.26.1
  Secure Endpoint Connector for Mac	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	Medium	CSCwo45640	1.26.1
  Secure Endpoint Connector for Windows	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	Medium	CSCwo45640	7.5.21 8.4.5
  Secure Endpoint Private Cloud	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	Medium	CSCwo45640	4.2.2 or earlier with updated connectors

  Cisco products may be impacted differently depending on implementation and usage of ClamAV. For information on the effects of this vulnerability on specific Cisco products, see the Details section of this advisory. 

  Products Confirmed Not Vulnerable

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

  Cisco has confirmed that this vulnerability does not affect the following Cisco products:

  • Secure Email Gateway
  • Secure Web Appliance

Details

• Impacts of ClamAV DoS Vulnerability on Affected Platforms

  This vulnerability, which has a Medium Security Impact Rating (SIR), affects Linux, Mac, and Windows-based platforms. Exploitation of the vulnerability could cause the scanning process to crash, delaying or preventing further scanning operations. However, overall system stability is not affected. See the Assessing Security Risk section of the Cisco Security Vulnerability Policy for information about vulnerability scoring and SIRs.

  Cisco Secure Endpoint Connector, which is distributed from Cisco Secure Endpoint Private Cloud, is affected by this vulnerability. Cisco Secure Endpoint Private Cloud is not affected.

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

  Fixed Releases

  At the time of publication, the release information in the following table was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.

  The left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability that is described in this advisory and which release included the fix for this vulnerability.

  Affected Cisco Software Platform	First Fixed Release
  Secure Endpoint Connector for Linux	1.26.11
  Secure Endpoint Connector for Mac	1.26.11
  Secure Endpoint Connector for Windows	7.5.211 8.4.51
  Secure Endpoint Private Cloud	4.2.2 and earlier2

  1. Updated releases of Cisco Secure Endpoint Connector are available through the Cisco Secure Endpoint portal. Depending on the configured policy, Cisco Secure Endpoint Connector will automatically update.

  2. Affected releases of Cisco Secure Endpoint Connector clients for Cisco Secure Endpoint Private Cloud have been updated in the connector repository. Customers will get these connector updates through normal content update processes.

  The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

Exploitation and Public Announcements

• The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Source

• Cisco would like to thank Volticks, working with Trend Micro Zero Day Initiative (ZDI), for reporting this vulnerability.

URL

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

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2025-JUN-18

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