The CSecurityTLS::processMsg function in common/rfb/CSecurityTLS.cxx in the vncviewer…
Priority LOW 29CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · None
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
EPSS 0.0129 70th percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
Red Hat 1 advisory
- RHSA-2011:0871 Released 2011-06-15 · Red Hat rating Moderatetigervnc security update
- Red Hat Enterprise Linux Server (v. 6) tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1, tigervnc-server-1.0.90-0.15.20110314svn4359.el6_1.1
- Red Hat Enterprise Linux Server Optional (v. 6) tigervnc-1.0.90-0.15.20110314svn4359.el6_1.1, tigervnc-server-applet-1.0.90-0.15.20110314svn4359.el6_1.1, tigervnc-server-module-1.0.90-0.15.20110314svn4359.el6_1.1
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2011:0871 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2011:0871 |
Timeline
- 2026-10-02 Threatist record created from CVE-2011-1775
- 2026-10-03 Alias added: GHSA-g8f8-5m52-5p35
References
Advisory 2
Other 7
- [oss-security] 20110506 CVE request: tigervnc
- [oss-security] 20110509 Re: CVE request: tigervnc
- [tigervnc-devel] 20110504 potential vulnerability in TLS secType?
- [tigervnc-devel] 20110504 Re: potential vulnerability in TLS secType?
- https://bugzilla.redhat.com/show_bug.cgi?id=702672
- https://bugzilla.redhat.com/show_bug.cgi?id=702470
- [tigervnc-devel] 20110505 Re: potential vulnerability in TLS secType?
More Tigervnc vulnerabilities
- TI-2026-26639 Incorrect permission assignment in TigerVNC CVSS 3.1CRITICAL 9.8
- TI-2017-03586 Buffer overflow in the ModifiablePixelBuffer::fillRect function in TigerVNC before 1.7.1… CVSS 3.0CRITICAL 9.8
- TI-2014-06801 XRegion in TigerVNC allows remote VNC servers to cause a denial of service (NULL pointer… CVSS 3.0CRITICAL 9.8
- TI-2014-00011 Out-of-bounds write in TigerVNC CVSS 3.1CRITICAL 9.8
- TI-2023-05938 Xorg-x11-server: out-of-bounds memory read in rrchangeoutputproperty and rrchangeproviderproperty CVSS 3.1HIGH 7.6
- TI-2017-05047 In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client… CVSS 3.0HIGH 8.8
Sources
- CVE-2011-1775 · CVE Program
- CVE-2011-1775 · NVD
- FIRST EPSS
- GHSA-g8f8-5m52-5p35 · GitHub Advisory Database · CC BY 4.0
- CVE-2011-1775 · Red Hat security data · CC BY 4.0
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