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CVE-2017-7395· NVD / CVE Program· CNA mitre

In TigerVNC 1.7.1 (SMsgReader.cxx SMsgReader::readClientCutText), by causing an integer overflow, an authenticated client can crash the serv

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.4% (FIRST EPSS); higher than 72.3% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: tigervnc (Debian:12) 1.7.0+dfsg-7; fltk (Red Hat:enterprise_linux:7::client) 0:1.3.4-1.el7; fltk-debuginfo (Red Hat:enterprise_linux:7::client) 0:1.3.4-1.el7.

Low priority for now. Upgrade to tigervnc (Debian:12) 1.7.0+dfsg-7; fltk (Red Hat:enterprise_linux:7::client) 0:1.3.4-1.el7; fltk-debuginfo (Red Hat:enterprise_linux:7::client) 0:1.3.4-1.el7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

In TigerVNC 1.7.1 (SMsgReader.cxx SMsgReader::readClientCutText), by causing an integer overflow, an authenticated client can crash the server.

MediumCVSS 6.5 · v3.0—No exploit Fix available
Published
Mar 31, 2017
Updated
Jun 16, 2026
EPSS
1.4% · 72th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.4%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
tigervnctigervnc

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • tigervnc tigervnc1.7.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12tigervncbefore 1.7.0+dfsg-71.7.0+dfsg-7
Red Hat:enterprise_linux:7::clientfltkbefore 0:1.3.4-1.el70:1.3.4-1.el7
Red Hat:enterprise_linux:7::clientfltk-debuginfobefore 0:1.3.4-1.el70:1.3.4-1.el7
Red Hat:enterprise_linux:7::clientfltk-develbefore 0:1.3.4-1.el70:1.3.4-1.el7
Red Hat:enterprise_linux:7::clientfltk-fluidbefore 0:1.3.4-1.el70:1.3.4-1.el7
Red Hat:enterprise_linux:7::clientfltk-staticbefore 0:1.3.4-1.el70:1.3.4-1.el7
Red Hat:enterprise_linux:7::clienttigervncbefore 0:1.8.0-1.el70:1.8.0-1.el7
Red Hat:enterprise_linux:7::clienttigervnc-debuginfobefore 0:1.8.0-1.el70:1.8.0-1.el7
Red Hat:enterprise_linux:7::clienttigervnc-iconsbefore 0:1.8.0-1.el70:1.8.0-1.el7
Red Hat:enterprise_linux:7::clienttigervnc-licensebefore 0:1.8.0-1.el70:1.8.0-1.el7
Red Hat:enterprise_linux:7::clienttigervnc-serverbefore 0:1.8.0-1.el70:1.8.0-1.el7
Red Hat:enterprise_linux:7::clienttigervnc-server-appletbefore 0:1.8.0-1.el70:1.8.0-1.el7
Red Hat:enterprise_linux:7::clienttigervnc-server-minimalbefore 0:1.8.0-1.el70:1.8.0-1.el7
Red Hat:enterprise_linux:7::clienttigervnc-server-modulebefore 0:1.8.0-1.el70:1.8.0-1.el7
SUSE:Linux Enterprise Desktop 12 SP1tigervncbefore 1.4.3-24.11.4.3-24.1
SUSE:Linux Enterprise Desktop 12 SP2tigervncbefore 1.6.0-18.11.11.6.0-18.11.1

Same product

tigervnc: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-0011Multiple heap-based buffer overflows in the ZRLE_DECODE function in common/rfb/zrleDecode.h in TigerVNC before 1.3.1, when NDEBUG is enabled
    40Plan
  • CVE-2017-5581Buffer overflow in the ModifiablePixelBuffer::fillRect function in TigerVNC before 1.7.1 allows remote servers to execute arbitrary code via
    40Plan
  • CVE-2014-8241XRegion in TigerVNC allows remote VNC servers to cause a denial of service (NULL pointer dereference) by leveraging failure to check a mallo
    40Plan
  • CVE-2026-34352In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application
    39Monitor
  • CVE-2017-7393In TigerVNC 1.7.1 (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to denial of serv
    36Monitor
  • CVE-2020-26117In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions.
    33Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:tigervnc1.7.0+dfsg-7 · Debian:12Package registry (OSV)
red hat:fltk0:1.3.4-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:fltk-debuginfo0:1.3.4-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:fltk-devel0:1.3.4-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:fltk-fluid0:1.3.4-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:fltk-static0:1.3.4-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tigervnc0:1.8.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tigervnc-debuginfo0:1.8.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tigervnc-icons0:1.8.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tigervnc-license0:1.8.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tigervnc-server0:1.8.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tigervnc-server-applet0:1.8.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:tigervnc-server-module0:1.8.0-1.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:tigervnc1.4.3-24.1 · SUSE:Linux Enterprise Desktop 12 SP1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records