description-logo Description

This indicates an attempt to connect to a VNC server via a VNC client.
VNC is a free desktop sharing system that uses the Remote Frame Buffer protocol to connect remotely to another computer. Upon a successful connection, a graphical interface is provided. To establish a connection, the client side has to have the VNC client installed and the server side, the VNC server. Multiple clients can connect to a VNC server at one time. The VNC client is used most commonly for remote technical support or remote access to a personal desktop at home. The source code is open source, thus there are many software that uses slight variations of the protocol.

affected-products-logoAffected Products


Impact logoImpact

Network bandwidth consumption


Browser-Based, Network-Protocol, Client-Server, Peer-to-Peer, Cloud-Based, Mobile-Device


  • Reasonable

Default Ports

  • TCP/80
  • TCP/5500
  • TCP/5900-5901

Version Updates

Date Version Detail
2024-02-27 26.740 Sig Added
2019-05-28 14.621 Sig Added
2019-04-03 14.585 Sig Added