01-30-2013 02:58 PM - edited 01-30-2013 03:06 PM
For most home users, the issue will be a router with UPnP enabled. It has always been a good practice to disable UPnP in the router settings in order to prevent any malware on your system from being able to open ports in the router without your knowledge. This vulnerability is exploitable from the internet - so it makes disabling UPnP in the router even more important. Norton can't change the router configuration to turn off UPnP - you will have to do that yourself. Of course, if you are using NIS or Norton 360, I believe the Norton Firewall would still block any unauthorized traffic that might get through a compromised router from accessing your computer.