VULNERABILITY INTELLIGENCE
CVE-2011-1775
CVSS score5.8 MEDIUM
EPSS probability1.29%
CISA KEVNot currently listed
Published2011-05-26
Last modified2026-06-16
CVSS vectorAV:N/AC:M/Au:N/C:P/I:P/A:N
Description
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.
Weakness classification
- CWE-20: Improper Input Validation