I was searching around for some info and found this tid bit in Agnitum's FAQ section. I figured I'd post this for any Outpost users who may be concerned by it.

We are aware that Outpost Firewall passes LeakTest and YALTA; fails TooLeaky, FireHole and OutBound because we have performed internal tests here at Agnitum. This vulnerability was discovered several months ago and we immediately started working on a new version of our engine because we consider this vulnerability is serious. The alpha version of Outpost Firewall being tested right now is able to block all these leak tests.
From
http://www.agnitum.com/support/outpo...html#security4