Looking in my junk mail just now and I see I've had 2 more of these emails.
One of which is obvious BS because it mentioned a supposed password which I've never used.
This one was supposed to be a hack via malware or spyware, which apparently happened "summer 2018".
It also mentioned something about Cisco router. Which is interesting as I don't use a router by Cisco.
I've got one not so long ago, I ignored it. I do some password reuse, but I've different classes of important so I won't use fluff website passwords for stuff I actually need.
Besides, my browsing history is nerdery, electronica, dumb searches and cat videos.
Actually reading that back it's kinda depressing that I have the world's knowledge at my fingertips and I'm using my time looking at Haku, Nagi and Poki.
I'll do better... after one last cat video. Maybe.
Change your password and you can ignore it, its just a scam from leaked emails/passwords from some sites.