Serial number: AV25-848
Date: December 17, 2025
Updated: December 17, 2025
On December 17, 2025, Cisco published a security advisory to address a critical vulnerability in the following products:
- Cisco Secure Email Gateway – all versions of AsyncOS with Spam Quarantine feature enabled and exposed on the internet
- Cisco Secure Email and Web Manager – all versions of AsyncOS with Spam Quarantine feature enabled and exposed on the internet
Update 1
On December 17, 2025, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2025-20393 to their Known Exploited Vulnerabilities (KEV) Database.
The Cyber Centre encourages users and administrators to review the provided web links, perform the suggested recommendations and apply the necessary updates when available.
