Multiple buffer overflows in Ipswitch IMail Server 2006 before 2006.21 (1) allow remote attackers to execute arbitrary code via unspecified vectors in Imailsec and (2) allow attackers to have an unknown impact via an unspecified vector related to "subscribe."
https://exchange.xforce.ibmcloud.com/vulnerabilities/35505
https://exchange.xforce.ibmcloud.com/vulnerabilities/35504
http://www.vupen.com/english/advisories/2007/2574
http://www.securitytracker.com/id?1018421
http://www.securityfocus.com/bid/24962
http://secunia.com/advisories/26123
http://docs.ipswitch.com/IMail%202006.21/ReleaseNotes/IMail_RelNotes.htm#NewRelease