CVE-2017-7393

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

8.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.82%Down 0.4 points since Apr 14, 2021

What each source reports

NVD Score used 8.8

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.

Record: CVE-2017-7393
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness: CWE-415
Updated: 2026-11-02

CVE List No score

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.

Record: CVE-2017-7393
Updated: 2026-11-02

EUVDEUVD-2017-16418 No score

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.

Record: EUVD-2017-16418
Updated: 2026-11-03

GitHub AdvisoriesGHSA-6qmp-qcvf-x3pr 8.8

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

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.

Record: GHSA-6qmp-qcvf-x3pr
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-415
Updated: 2026-11-02

OSV 8.8

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.

Record: CVE-2017-7393
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2017-7393 8.8

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.

Record: DEBIAN-CVE-2017-7393
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

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OSVRHSA-2017:2000 7.5

Red Hat Security Advisory: tigervnc and fltk security, bug fix, and enhancement update

Record: RHSA-2017:2000
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-7393 8.8

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.

Record: UBUNTU-CVE-2017-7393
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVSUSE-SU-2017:1093-1 No score

Security update for tigervnc

This update for tigervnc provides the several fixes.

These security issues were fixed:

CVE-2017-7392, CVE-2017-7396: Client can cause leak in VNC server (bsc#1031886)
CVE-2017-7395: Authenticated VNC client can crash VNC server (bsc#1031877)
CVE-2017-7394: Client can crash or block VNC server (bsc#1031879)
CVE-2017-7393: Authenticated client can cause double free in VNC server (bsc#1031875)
Prevent buffer overflow in VNC client, allowing for crashing the client (bnc#1032880)

Record: SUSE-SU-2017:1093-1
Updated: 2026-11-02

OSVSUSE-SU-2017:1094-1 No score

Security update for tigervnc

This update for tigervnc provides the several fixes.

These security issues were fixed:

CVE-2017-7392, CVE-2017-7396: Client can cause leak in VNC server (bsc#1031886)
CVE-2017-7395: Authenticated VNC client can crash VNC server (bsc#1031877)
CVE-2017-7394: Client can crash or block VNC server (bsc#1031879)
CVE-2017-7393: Authenticated client can cause double free in VNC server (bsc#1031875)
Prevent buffer overflow in VNC client, allowing for crashing the client (bnc#1032880)

These non-security issues were fixed:

Prevent client disconnection caused by invalid cursor manipulation. (bsc#1024929, bsc#1031045)
Readd index.vnc. (bsc#1026833)
Crop operations to visible screen. (bnc#1032272)

Record: SUSE-SU-2017:1094-1
Updated: 2026-11-02

Affected products

tigervnc

Affected packages

Affected packages
Package	Affected	Fixed
`tigervnc` Debian:12	before 1.7.0+dfsg-7	1.7.0+dfsg-7
`tigervnc` Debian:13	before 1.7.0+dfsg-7	1.7.0+dfsg-7
`tigervnc` Debian:14	before 1.7.0+dfsg-7	1.7.0+dfsg-7
`fltk-debuginfo` Red Hat:enterprise_linux:7::client	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-devel` Red Hat:enterprise_linux:7::client	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-fluid` Red Hat:enterprise_linux:7::client	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-static` Red Hat:enterprise_linux:7::client	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`tigervnc-debuginfo` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-applet` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-module` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7

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Affected packages
Package	Affected	Fixed
`fltk` Red Hat:enterprise_linux:7::client	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`tigervnc` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-icons` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-license` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-minimal` Red Hat:enterprise_linux:7::client	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`fltk` Red Hat:enterprise_linux:7::computenode	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-debuginfo` Red Hat:enterprise_linux:7::computenode	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-devel` Red Hat:enterprise_linux:7::computenode	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-fluid` Red Hat:enterprise_linux:7::computenode	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-static` Red Hat:enterprise_linux:7::computenode	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`tigervnc` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-debuginfo` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-icons` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-applet` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-module` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-license` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-minimal` Red Hat:enterprise_linux:7::computenode	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`fltk-debuginfo` Red Hat:enterprise_linux:7::server	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-devel` Red Hat:enterprise_linux:7::server	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-fluid` Red Hat:enterprise_linux:7::server	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-static` Red Hat:enterprise_linux:7::server	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`tigervnc-debuginfo` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-applet` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-module` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`fltk` Red Hat:enterprise_linux:7::server	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`tigervnc` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-icons` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-license` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-minimal` Red Hat:enterprise_linux:7::server	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`fltk-debuginfo` Red Hat:enterprise_linux:7::workstation	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-devel` Red Hat:enterprise_linux:7::workstation	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-fluid` Red Hat:enterprise_linux:7::workstation	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`fltk-static` Red Hat:enterprise_linux:7::workstation	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`tigervnc-debuginfo` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-applet` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-module` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`fltk` Red Hat:enterprise_linux:7::workstation	before 0:1.3.4-1.el7	0:1.3.4-1.el7
`tigervnc` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-icons` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-license` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc-server-minimal` Red Hat:enterprise_linux:7::workstation	before 0:1.8.0-1.el7	0:1.8.0-1.el7
`tigervnc` SUSE:Linux Enterprise Desktop 12 SP1	before 1.4.3-24.1	1.4.3-24.1
`tigervnc` SUSE:Linux Enterprise Server 12 SP1	before 1.4.3-24.1	1.4.3-24.1
`tigervnc` SUSE:Linux Enterprise Server for SAP Applications 12 SP1	before 1.4.3-24.1	1.4.3-24.1
`tigervnc` SUSE:Linux Enterprise Desktop 12 SP2	before 1.6.0-18.11.1	1.6.0-18.11.1
`tigervnc` SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2	before 1.6.0-18.11.1	1.6.0-18.11.1
`tigervnc` SUSE:Linux Enterprise Server 12 SP2	before 1.6.0-18.11.1	1.6.0-18.11.1
`tigervnc` SUSE:Linux Enterprise Server for SAP Applications 12 SP2	before 1.6.0-18.11.1	1.6.0-18.11.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-7393 is a high vulnerability (CVSS 8.8) in Tigervnc, published April 1, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.82%, the 78th percentile. Fixed in tigervnc 1.7.0+dfsg-7.

References

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