No System Group Advisory #09 – Citadel/UX versions 6.27 and below suffer from a format string vulnerability that allows for remote root exploitation.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/35296/nsg-advisory-09.txt
Source: https://packetstormsecurity.com/files/35296/nsg-advisory-09.txt.html