The CMsgReader::readRect function in the VNC Viewer component in RealVNC VNC Free Edition 4.0 through 4.1.2, Enterprise Edition E4.0 through E4.4.2, and Personal Edition P4.0 through P4.4.2 allows remote VNC servers to execute arbitrary code via crafted RFB protocol data, related to "encoding type."
https://www.redhat.com/archives/fedora-package-announce/2009-January/msg01025.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9367
https://exchange.xforce.ibmcloud.com/vulnerabilities/47937
https://exchange.xforce.ibmcloud.com/vulnerabilities/45969
http://www.vupen.com/english/advisories/2008/2868
http://www.securityfocus.com/bid/33263
http://www.securityfocus.com/bid/31832
http://www.redhat.com/support/errata/RHSA-2009-0261.html
http://www.realvnc.com/products/upgrade.html
http://www.realvnc.com/products/free/4.1/release-notes.html
http://www.realvnc.com/pipermail/vnc-list/2008-November/059432.html
http://www.gentoo.org/security/en/glsa/glsa-200903-17.xml
http://sunsolve.sun.com/search/document.do?assetkey=1-26-248526-1
http://sunsolve.sun.com/search/document.do?assetkey=1-21-140455-01-1
http://secunia.com/advisories/34184