Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area.
https://usn.ubuntu.com/4587-1/
https://security.gentoo.org/glsa/201702-24
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11
https://github.com/LibVNC/libvncserver/pull/137