Cisco Secure Email Gateway Zero-Day RCE Exploited in Active Attacks

Cisco has confirmed an ongoing cyberattack campaign targeting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager appliances, in which threat actors are executing arbitrary commands with root-level privileges on affected systems.   The company became aware of the attack on December 10, 2025, following an investigation of a TAC support case that revealed evidence of persistent backdoors installed […]

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