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VMware has a built-in VNC server on both ESX and their desktop virtualization products.[1] If you don't configure a password to connect, no password is require

• chungy 11y ago
  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.
  • dec0dedab0de 11y ago
    The built-in ones on Windows, Mac, Linux should all do fine Until they need to legitimately open a service.