Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: TCP/UDP Port 5900 Activity - Internet Security | DShield TCP/UDP Port 5900 Activity

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Port Information
Protocol Service Name
tcp vnc Virtual Network Computer
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User Comments
Submitted By Date
K. P. 2009-10-04 18:45:22
RealVNC ( prior 12-May-2006 has "Password Authentication Bypass Vulnerability" ( ,
Andrew Daviel 2006-06-11 19:53:09
Actively being exploited May/June 2006 etc.
Patrick K. 2005-11-21 22:57:46
A VNC server listens on two ports. The exact port numbers depend on the VNC display number, because a single machine may run multiple servers. The most important one is 59xx, where xx is the display number. The VNC protocol itself runs over this port. So for most PC servers, the port will be 5900, because they use display 0 by default. (See also, port 5800.)
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