Buffer overflow in NTLM authentication in MailEnable Professional 2.0 and Enterprise 2.0 allows remote attackers to execute arbitrary code via "the signature field of NTLM Type 1 messages".
https://exchange.xforce.ibmcloud.com/vulnerabilities/29284
http://www.vupen.com/english/advisories/2006/3862
http://www.securityfocus.com/bid/20290
http://www.mailenable.com/hotfix/