Stack-based buffer overflow in the trace message functionality in Pegasus Mail 4.21a through 4.21c and 4.30PB1 allow remote attackers to execute arbitrary code via a long POP3 reply.
http://www.vupen.com/english/advisories/2005/3004
http://www.securityfocus.com/bid/15973
http://www.securityfocus.com/archive/1/419908/100/0/threaded
http://www.pmail.com/newsflash.htm#secunia
http://securitytracker.com/id?1015385