For anyone using realvnc on Windows there is a security flaw, at least in the 4.1.1 version. Some information is available at the this link http<http://www.kb.cert.org/vuls/id/117929>://www.kb.cert.org/vuls/id/117929<http://www.kb.cert.org/vuls/id/117929>. There is a patch on the realvnc web site.
George