CVE-2011-1775

Severity: medium (CVSS 5.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-05-26 · updated 2026-06-16
Weakness: CWE-20

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.

Affected products

Kaspersky TigerVNC: 1.1-beta1

References

http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060567.html
http://openwall.com/lists/oss-security/2011/05/06/2
http://openwall.com/lists/oss-security/2011/05/09/7
http://secunia.com/advisories/44939
http://www.mail-archive.com/tigervnc-devel%40lists.sourceforge.net/msg01342.html
http://www.mail-archive.com/tigervnc-devel%40lists.sourceforge.net/msg01345.html
http://www.mail-archive.com/tigervnc-devel%40lists.sourceforge.net/msg01347.html
http://www.redhat.com/support/errata/RHSA-2011-0871.html
http://www.securityfocus.com/bid/47738
https://bugzilla.redhat.com/show_bug.cgi?id=702470
https://bugzilla.redhat.com/show_bug.cgi?id=702672
http://lists.fedoraproject.org/pipermail/package-announce/2011-May/060567.html

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