It is low, Shodan has found more than 10,000 VNC that have disabled authentication: https://www.shodan.io/search?query=rfb+authentication+disabled https://www.

It is low, Shodan has found more than 10,000 VNC that have disabled authentication: https://www.shodan.io/search?query=rfb+authentication+disabled https://www.shodan.io/search?query=rfb+authentication+disabl... And there are roughly 550,000 VNC servers on the Internet: https://www.shodan.io/search?query=rfb https://www.shodan.io/search?query=rfb