Symantec Messaging Gateway (SMG) before 10.0 has a default password for an unspecified account, which makes it easier for remote attackers to obtain privileged access via an SSH session.
https://exchange.xforce.ibmcloud.com/vulnerabilities/78034
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-3526
http://www.securityfocus.com/bid/55143
http://packetstormsecurity.com/files/116277/Symantec-Messaging-Gateway-9.5-Default-SSH-Password.html