Multiple buffer overflows in Melange Chat server 2.02 allow remote or local attackers to cause a denial of service (crash) and possibly execute arbitrary code via (1) a long argument in the /yell command, (2) long lines in the /etc/melange.conf configuration file, (3) long file names, or possibly other attacks.
http://www.securityfocus.com/bid/4510
http://www.securityfocus.com/bid/4509
http://www.securityfocus.com/bid/4508
http://www.iss.net/security_center/static/8846.php