A 0-day exploit in Microsoft IIS 5/6 FTP was recently published on Milw0rm while HDMoore is porting the bug to Metasploit.
Alienvault’s feed customers are protected with the directive released today:
http://isc.sans.org/diary.html?storyid=7039
UPDATE:
We have previously coverage with two directives present on Alienvault Professional Feed: