SB2025121749 - Remote code execution in Cisco Secure Email Gateway And Cisco Secure Email and Web Manager
Published: December 17, 2025 Updated: January 16, 2026
Security Bulletin ID
SB2025121749
Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2025-20393)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient validation of user-supplied input. A remote non-authenticated attacker can send specially crafted packets to the device and execute arbitrary code with root privileges.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.