specifics on cisco DOS?

[books () mail state fl us (Roger Books)]

Does anyone have specifics on the latest DoS on cisco routers?

http://www.cisco.com/warp/public/770/ioslogin-pub.shtml

I have been assigned the task of determining not only if
we are vulnerable, but how difficult it is to perform
the attack.

Pointers to C source/fragments would work also.  I can
reverse engineer if necessary.

Roger Books