CVE-2011-1775
The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2011-1775- CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2011-1775- Updated
- 2026-11-02
EUVDEUVD-2011-1773 No score
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.
- Record
EUVD-2011-1773- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g8f8-5m52-5p35 No score
The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer component...
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.
- Record
GHSA-g8f8-5m52-5p35- Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
tigervncRed Hat:enterprise_linux:6::server |
before 0:1.0.90-0.15.20110314svn4359.el6_1.1 | 0:1.0.90-0.15.20110314svn4359.el6_1.1 |
tigervnc-debuginfoRed Hat:enterprise_linux:6::server |
before 0:1.0.90-0.15.20110314svn4359.el6_1.1 | 0:1.0.90-0.15.20110314svn4359.el6_1.1 |
tigervnc-serverRed Hat:enterprise_linux:6::server |
before 0:1.0.90-0.15.20110314svn4359.el6_1.1 | 0:1.0.90-0.15.20110314svn4359.el6_1.1 |
tigervnc-server-appletRed Hat:enterprise_linux:6::server |
before 0:1.0.90-0.15.20110314svn4359.el6_1.1 | 0:1.0.90-0.15.20110314svn4359.el6_1.1 |
tigervnc-server-moduleRed Hat:enterprise_linux:6::server |
before 0:1.0.90-0.15.20110314svn4359.el6_1.1 | 0:1.0.90-0.15.20110314svn4359.el6_1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-1775 is a medium vulnerability (CVSS 5.8) in Tigervnc, published May 26, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.29%, the 70th percentile. Fixed in tigervnc 0:1.0.90-0.15.20110314svn4359.el6_1.1.
References
openwall.com/lists/oss-security/2011/05/06/2
mail-archive.com/tigervnc-devel%40lists.sourceforge.net/msg01342.html
bugzilla.redhat.com/show_bug.cgi?id=702672
lists.fedoraproject.org/pipermail/package-announce/2011-May/060567.html
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redhat.com/support/errata/RHSA-2011-0871.html
secunia.com/advisories/44939
securityfocus.com/bid/47738
nvd.nist.gov/vuln/detail/CVE-2011-1775
github.com/advisories/GHSA-g8f8-5m52-5p35
access.redhat.com/errata/RHSA-2011:0871
security.access.redhat.com/data/csaf/v2/advisories/2011/rhsa-2011_0871.json
cve.org/CVERecord?id=CVE-2011-1775