Symantec Enterprise Firewall/VPN Appliances 100, 200, and 200R running firmware before 1.63 allow remote attackers to cause a denial of service (device freeze) via a fast UDP port scan on the WAN interface.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17469
http://www.securityfocus.com/bid/11237
http://www.kb.cert.org/vuls/id/441078
http://securityresponse.symantec.com/avcenter/security/Content/2004.09.22.html