The SMTP service of MailEnable Standard 1.92 and earlier, Professional 2.0 and earlier, and Enterprise 2.0 and earlier before the MESMTPC hotfix, allows remote attackers to cause a denial of service (application crash) via a HELO command with a null byte in the argument, possibly triggering a length inconsistency or a missing argument.
secunia.com/advisories/20790
securitytracker.com/id?1016376
www.divisionbyzero.be/?p=173
www.divisionbyzero.be/?p=174
www.mailenable.com/hotfix/mesmtpc.zip
www.osvdb.org/26791
www.securityfocus.com/archive/1/438374/100/0/threaded
www.securityfocus.com/bid/18630
www.vupen.com/english/advisories/2006/2520
exchange.xforce.ibmcloud.com/vulnerabilities/27387