Sygate personal firewall 5.0 could allow remote attackers to bypass firewall filters via spoofed (1) source IP address of 127.0.0.1 or (2) network address of 127.0.0.0.
http://www22.brinkster.com/nssitech/nssilabs/nssi-2002-sygatepfw5.html
http://www.securiteam.com/windowsntfocus/5WP0I2A8AI.html
http://www.iss.net/security_center/static/10108.php
http://www.derkeiler.com/Mailing-Lists/VulnWatch/2002-09/0015.html