Cisco warns of active zero-day root RCE in Secure Email Gateway AsyncOS
What happened.Cisco published an emergency advisory warning of an actively exploited zero-day command injection flaw affecting Cisco Secure Email Gateway appliances.
Why it matters.Secure Email Gateway appliances filter inbound and outbound email traffic for enterprise communications. When incoming email parsing triggers root remote code execution, unauthenticated attackers compromise corporate email infrastructure and pivot into enterprise networks. Infrastructure teams must apply Cisco AsyncOS maintenance releases immediately. Security operations engineers should inspect mail logs for unauthorized command patterns.