Netgear RM-356 and RT-338 series SOHO routers allow remote attackers to cause a denial of service (crash) via a UDP port scan, as demonstrated using nmap.
http://www.securityfocus.com/bid/4111
http://www.iss.net/security_center/static/8206.php
http://archives.neohapsis.com/archives/bugtraq/2002-02/0183.html
http://archives.neohapsis.com/archives/bugtraq/2002-02/0162.html