CVE-2011-1775: Tigervnc

Medium severity, CVSS 5.8. EPSS: 1.3% chance of exploitation in the next 30 days.

The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component in TigerVNC 1.1beta1 does not properly verify the server's X.509 certificate, which allows man-in-the-middle attackers to spoof a TLS VNC server via an arbitrary certificate.

Affected products

• Tigervnc Tigervnc: version 1.1 only

Published 2011-05-26. Last modified 2026-06-16.