Integer overflow in the MallocFrameBuffer function in vncviewer.c in LibVNCServer 0.9.9 and earlier allows remote VNC servers to cause a denial of service (crash) and possibly execute arbitrary code via an advertisement for a large screen size, which triggers a heap-based buffer overflow.
https://www.kde.org/info/security/advisory-20140923-1.txt
https://github.com/newsoft/libvncserver/commit/045a044e8ae79db9244593fbce154cdf6e843273
http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
http://www.openwall.com/lists/oss-security/2014/09/25/11
http://www.ocert.org/advisories/ocert-2014-007.html
http://www.debian.org/security/2014/dsa-3081
http://secunia.com/advisories/61506
http://seclists.org/oss-sec/2014/q3/639
http://rhn.redhat.com/errata/RHSA-2015-0113.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-September/139445.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-October/139654.html