QEMU and VirtualBox have VNC servers too. Can be a handy feature.
Why this would be exposed to the public Internet, I have no idea. Maybe some poor soul was doing this in a combination of being directly plugged in, no NAT/router in the way, and lack of or weak OS-side firewall.
Speaking of NAT, IPv6 might make these things even riskier, but I hope most people are running a firewall on their OS. The built-in ones on Windows, Mac, Linux should all do fine.
Why this would be exposed to the public Internet, I have no idea. Maybe some poor soul was doing this in a combination of being directly plugged in, no NAT/router in the way, and lack of or weak OS-side firewall.
Speaking of NAT, IPv6 might make these things even riskier, but I hope most people are running a firewall on their OS. The built-in ones on Windows, Mac, Linux should all do fine.