VNC 4.1 - Critical Bug - Login fara password

"IntelliAdmin has discovered a critical flaw that allows an attacker to control any machine running VNC 4.1. The flaw grants access without the attacker obtaining a password. The details of the vulnerability have not been released, but their website has a proof of concept that allows you to test your own VNC installation for the vulnerability"http://www.intelliadmin.com/blog/2006/05/vnc-flaw-proof-of-concept.html