You need to delete this and move on. You don't have the Cisco gear it affects and as of today Cisco writes "There are no workarounds that address this vulnerability."
This means the people sending this ransom note are fishing. Don't take the bait and stop opening every email you get.
I got ransomware-type email today regarding the Cisco router, vulnerability CVE-2018-0296 asking for payment in bitcoin. How do I know if it is real? The pages I find on Google for how to repair this vulnerability all look sketchy to me. I don't personally use a Cisco router, either. Could I have picked it up in my travels?