CVE-2016-9942: Libvncserver Project Libvncserver

Critical severity, CVSS 9.8. EPSS: 3.8% chance of exploitation in the next 30 days.

Heap-based buffer overflow in ultra.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 with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.

Affected products

• Libvncserver Project Libvncserver: version 0.9.10 only

Published 2016-12-31. Last modified 2026-06-17.