Cisco Secure Email Gateway Email Filter Bypass Vulnerability

A vulnerability exists in the email filtering mechanism of Cisco Secure Email Gateway, allowing an unauthenticated, remote attacker to bypass established email rules. This flaw enables emails that should have been blocked to be delivered through affected devices. The issue arises from improper handling of certain emails, which attackers can exploit by sending crafted messages that evade filters.

Impact

Exploitation of this vulnerability allows for unauthorized bypassing of email filters, potentially leading to the delivery of malicious emails that could be used for further attacks or to compromise users.

Remediation

Cisco has released software updates to address this vulnerability. Instructions for upgrading can be found in the Cisco Security Vulnerability Policy. Users should consult the Cisco Security Advisories page for information on fixed releases.