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CVE-2017-7394

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can...

7.5 HighFix available

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.61%Up 0.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Record
CVE-2017-7394
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Record
CVE-2017-7394
Updated
2026-11-02
EUVDEUVD-2017-16419 No score

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Record
EUVD-2017-16419
Updated
2026-11-03
GitHub AdvisoriesGHSA-p2f4-v5gm-9wqj 7.5

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can...

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Record
GHSA-p2f4-v5gm-9wqj
CVSS 3.0
7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-20
Updated
2026-11-02
OSV 7.5

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Record
CVE-2017-7394
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
OSVDEBIAN-CVE-2017-7394 7.5

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Record
DEBIAN-CVE-2017-7394
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
Show 4 moreShow less
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-2017-7394 7.5

In TigerVNC 1.7.1 (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames.

Record
UBUNTU-CVE-2017-7394
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
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

Affected packages

Affected packages
PackageAffectedFixed
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
Show 52 moreShow less
Affected packages
PackageAffectedFixed
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
RecordedChangedSources
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2017-7394 is a high vulnerability (CVSS 7.5) in Tigervnc, published April 1, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.61%, the 76th percentile. Fixed in tigervnc 1.7.0+dfsg-7.

References

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