CVE-2023-27830: Tightvnc

Critical severity, CVSS 9.0. EPSS: 1.1% chance of exploitation in the next 30 days.

TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted files when executing a file transfer. This is due to the fact that TightVNC runs in the backend as a high-privileges account.

Affected products

• Tightvnc Tightvnc: before 2.8.75 (fixed in 2.8.75)

Published 2023-04-12. Last modified 2026-06-17.