Multiple stack-based buffer overflows in YPOPs! (aka YahooPOPS) 0.4 through 0.6 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long (1) POP3 USER command or (2) SMTP request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17518
https://exchange.xforce.ibmcloud.com/vulnerabilities/17515
http://www.attrition.org/pipermail/vim/2006-October/001089.html
http://securitytracker.com/alerts/2004/Sep/1011426.html
http://secunia.com/advisories/12660