libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.
https://usn.ubuntu.com/4407-1/
https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclient
https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fed
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html