Port Sentry Vunerability's?

does anyone know of any exploits/vunerabilitys in portsentry? I have heard that it has trouble with IPV6, NULL, XMAS, and FIN packets. I ask because i work for a school district who has a BESS filter and i run a proxy server for the times i am at a machine within the district (other than my own) and must get around the filter. The problem is that some students are possibly able to run customized port scans using tools such as nmap and info has been leaked to the student body that there are linux servers and proxy servers within the network. If a student were able to access this proxy server, this would mean that all other servers within the district would be vunerable (all of which have pretty much equal protection).

Howdy.

You might like to have a look over at Milw0rm only because i remember seeing something similar over there..

Hope you find what your looking for.

cheers
f2B