Buffer overflow in Citadel/UX 6.23 and earlier allows remote attackers to cause a denial of service via a long username.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16840
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-1699
http://www.securityfocus.com/bid/10833
http://www.nosystem.com.ar/advisories/advisory-04.txt
http://securitytracker.com/id?1010809
http://secunia.com/advisories/12197