Trend Micro ScanMail for Microsoft Exchange (SMEX) 10.2 before Hot Fix Build 3318 and 11.0 before Hot Fix Build 4180 creates session IDs for the web console using a random number generator with predictable values, which makes it easier for remote attackers to bypass authentication via a brute force attack.
http://www.securitytracker.com/id/1032323
http://www.securityfocus.com/bid/74661
http://esupport.trendmicro.com/solution/en-US/1109669.aspx
http://blog.malerisch.net/2016/05/trendmicro-smex-session-predictable-cve-2015-3326.html