Multiple buffer overflows in the SMTP Service for ESMTP CMailServer 4.0.2003.03.27 allow remote attackers to execute arbitrary code via long (1) MAIL FROM or (2) RCPT TO commands.
https://exchange.xforce.ibmcloud.com/vulnerabilities/11975
http://www.securityfocus.com/bid/7548
http://www.securityfocus.com/bid/7547
http://marc.info/?l=bugtraq&m=105258772101349&w=2
http://archives.neohapsis.com/archives/vulnwatch/2003-q2/0062.html