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TI-2017-05047 Aliases CVE-2017-7393GHSA-6qmp-qcvf-x3pr

In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client…

Priority MEDIUM 42CWE-415Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-415 and the CVSS impact.

Summary

In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of service or potentially code execution.

Why it matters now

EPSS 0.0182 78th 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

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:tigervnc:tigervnc:1.7.1:*:*:*:*:*:*:*1.7.1VulnerableTigerVNC
  • cpe:2.3:a:tigervnc:tigervnc:1.7.1:*:*:*:*:*:*:* Versions 1.7.1 Vulnerable ·TigerVNC

Remediation

Red Hat 1 advisory

  • RHSA-2017:2000 Released 2017-08-01 · Red Hat rating Moderate
    tigervnc and fltk security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) fltk-1.3.4-1.el7, tigervnc-1.8.0-1.el7, tigervnc-icons-1.8.0-1.el7 +3
    • Red Hat Enterprise Linux Client Optional (v. 7) fltk-devel-1.3.4-1.el7, fltk-fluid-1.3.4-1.el7, fltk-static-1.3.4-1.el7 +2
    • Red Hat Enterprise Linux ComputeNode (v. 7) tigervnc-1.8.0-1.el7, tigervnc-license-1.8.0-1.el7, tigervnc-server-minimal-1.8.0-1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) fltk-1.3.4-1.el7, fltk-devel-1.3.4-1.el7, fltk-fluid-1.3.4-1.el7 +6
    • Red Hat Enterprise Linux Server (v. 7) fltk-1.3.4-1.el7, fltk-1.3.4-1.el7.ppc, tigervnc-1.8.0-1.el7 +4
    • Red Hat Enterprise Linux Server Optional (v. 7) fltk-devel-1.3.4-1.el7, fltk-devel-1.3.4-1.el7.ppc, fltk-fluid-1.3.4-1.el7 +4
    • Red Hat Enterprise Linux Workstation (v. 7) fltk-1.3.4-1.el7, tigervnc-1.8.0-1.el7, tigervnc-icons-1.8.0-1.el7 +3
    • Red Hat Enterprise Linux Workstation Optional (v. 7) fltk-devel-1.3.4-1.el7, fltk-fluid-1.3.4-1.el7, fltk-static-1.3.4-1.el7 +2

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2017:2000
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2017:2000
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2017:2000
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2017:2000
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2017:2000
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2017:2000
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2017:2000
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2017:2000
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-7393
  2. 2026-10-03 Alias added: GHSA-6qmp-qcvf-x3pr

References

Patch 1

Advisory 2

  • 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-2020-15960 In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers… CVSS 3.1HIGH 8.1
See all 29 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences