// REFERENCE
Port 5900 (VNC)
Protocol: TCP
Service: VNC
High risk
VNC: cross-platform remote desktop. Often without a password or with weak encryption; exposed it allows taking graphical control of the machine. Tunnel it over SSH or VPN.
Related tools
Work with this in:
Related
22
Port 22 (SSH) 23
Port 23 (Telnet) 1194
Port 1194 (OpenVPN) 1723
Port 1723 (PPTP VPN) 2222
Port 2222 (alternate SSH) 3389
Port 3389 (RDP)
Port 22 (SSH) 23
Port 23 (Telnet) 1194
Port 1194 (OpenVPN) 1723
Port 1723 (PPTP VPN) 2222
Port 2222 (alternate SSH) 3389
Port 3389 (RDP)
Assignments per the IANA port registry. Educational content.