Buffer overflow in the POP3 server in Kinesphere Corporation eXchange before 5.0.060125 allows remote attackers to execute arbitrary code via a long RCPT TO argument.
https://www.exploit-db.com/exploits/1466
https://exchange.xforce.ibmcloud.com/vulnerabilities/24477
http://www.vupen.com/english/advisories/2006/0437
http://securitytracker.com/id?1015580
http://securityreason.com/securityalert/408
http://secunia.com/advisories/18687
http://archives.neohapsis.com/archives/bugtraq/2006-02/0040.html