CVE-2001-1422: Att Winvnc

High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.

WinVNC 3.3.3 and earlier generates the same challenge string for multiple connections, which allows remote attackers to bypass VNC authentication by sniffing the challenge and response of other users.

Affected products

• Att Winvnc: up to and including 3.3.3

Published 2001-01-23. Last modified 2026-06-16.