Norton Personal Firewall 2002 4.0, when configured to automatically block attacks, allows remote attackers to block IP addresses and cause a denial of service via spoofed packets.
http://www.iss.net/security_center/static/10314.php
http://online.securityfocus.com/archive/1/294411
http://archives.neohapsis.com/archives/bugtraq/2002-10/0156.html