By worm level I mean it's a remote code execution attack which can be propagated over the internet. Someone can write a little piece of code that scans for ran

By worm level I mean it's a remote code execution attack which can be propagated over the internet. Someone can write a little piece of code that scans for random hosts, runs the attack and installs itself on the target system which then does the same until it's taken over all vulnerable hosts. It can self-replicate extremely fast. This was a huge issue back in the Blaster/Sasser days of early Windows XP when plugging in a machine to the internet directly was common. Servers and home routers are often plugged into the internet directly and often run Linux. So if this is easily exploitable it could turn into a real disaster. Heartbleed can't be turned into a worm because there's no code execution, just information disclosure, with this there is.