High Threat Security Alert (A26-08-12): Multiple Vulnerabilities in Cisco ClamAV

Description:

Cisco has released security updates to address multiple vulnerabilities in several Cisco devices and software. For information about the vulnerabilities and the attacking vectors, please refer to the corresponding security advisories at the vendor's website.

Reports indicated that proof-of-concept (PoC) exploit code is available for denial of service vulnerabilities (CVE-2026-20337 and CVE-2026-20338). System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

Affected Systems:

• Cisco ClamAV

For detailed information of the affected products, please refer to the section "Affected Products" of corresponding security advisory at vendor's website.

Impact:

Depending on the vulnerabilities exploited, a successful attack could lead to denial of service on an affected system.

Recommendation:

System administrators of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk. For detailed information of the available patches, please refer to the section "Fixed Software" of corresponding security advisory at vendor's website.

System administrators should contact their product support vendors for the fixes and assistance.

More Information:

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-WuuvVd26
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20337 (to CVE-2026-20339)
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20345 (to CVE-2026-20348)