chat.ghp in Easy Chat Server 1.2 allows remote attackers to add a large number of fake users, then eventually cause a denial of service (server crash).
https://exchange.xforce.ibmcloud.com/vulnerabilities/16633
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-2458
http://www.autistici.org/fdonato/advisory/EasyChatServer1.2-adv.txt
http://secunia.com/advisories/12006
http://archives.neohapsis.com/archives/fulldisclosure/2004-07/0077.html
http://archives.neohapsis.com/archives/bugtraq/2004-07/0013.html