CVE-2020-25708: Debian Linux

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw to send a specially crafted message that, when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service.

Affected products

• Debian Debian Linux: version 10.0 only
• Libvncserver Project Libvncserver: version 0.9.12 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only

Published 2020-11-27. Last modified 2026-06-17.