The latest vulnerability on AIM users has been reported by w00w00 that allows any user on the AIM system to remotely penetrate your computer without you even knowing it.
“We recommend Robbie Saunder’s AIM Filter (http://www.ssnbc.com/wiz)
to protect yourselves. A temporary solution is to go into your
Preferences and in the Privacy section click “Allow Only Users on My
Buddy List” under “Who can contact me.”