Cisco AsyncOS on Email Security Appliance (ESA) devices through 9.7.0-125 allows remote attackers to bypass malware detection via a crafted attachment in an e-mail message, aka Bug ID CSCuz14932.
http://www.securityfocus.com/bid/92155
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160727-esa