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Cisco Email Security Appliance Attachment Filter Bypass Vulnerability CVE-2017-6671

CVSSv3 Score
Vulnerability description

A vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass configured filters on the device.

Risk description

The vulnerability is due to improper input validation of an email with an attachment and modified Multipurpose Internet Mail Extensions (MIME) header. An attacker could exploit this vulnerability by sending a malformed email message with an attachment. A successful exploit could allow the attacker to bypass configured message filters to drop the email. The email may not be RFC compliant. However, some mail clients could still allow users to read the email, which may not have been properly filtered by the device.


See the referenced vendor advisory for a solution.

Not available
Detectable with
Network Scanner
Scan engine
Exploitable with Sniper
CVE Published
Jun 13, 2017
Detection added at
Software Type
Not available
Not available
Not available