[icedchai]

"Just add an entry to your routing table" ... it's virtually impossible to do that for RFC-1918 addresses across the internet. It will be filtered at the ISP border or an upstream. Is it theoretically possible? Yes. Is it an actual risk? Probably not.

[megous]

Well, if you're other customer of the ISP on the same network, then that may get more interesting... (or inside VPS provider's network)