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Fencer Intel
high 7.5

CVE-2014-6052 json

The HandleRFBServerMessage function in libvncclient/rfbproto.c in LibVNCServer 0.9.9 and earlier does not check certain malloc return value…

published 11y ago modified 4mo ago also EUVD-2014-5940

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.8%
EPSS 6.8% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

The HandleRFBServerMessage function in libvncclient/rfbproto.c in LibVNCServer 0.9.9 and earlier does not check certain malloc return values, which allows remote VNC servers to cause a denial of service (application crash) or possibly execute arbitrary code by specifying a large screen size in a (1) FramebufferUpdate, (2) ResizeFrameBuffer, or (3) PalmVNCReSizeFrameBuffer message.

Patch / fix

  • veyon Debian 13, Debian 12 4.1.4+repack1-1
  • libvncserver Debian 14, Debian 13, Debian 12 0.9.9+dfsg-6.1

debian advisories DEBIAN-CVE-2014-6052

  • italc Ubuntu 16.04 LTS 1:2.0.2+dfsg1-4ubuntu0.1
  • libvncserver Ubuntu 14.04 LTS 0.9.9+dfsg-1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2014-6052

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libvncserver RHEL 6 0.9.7-7.el6_6.1
  • libvncserver RHEL 7 0.9.9-9.el7_0.1

red hat advisories RHSA-2014:1826

  • LibVNCServer SLES 12 SP1, SLES 12, SLED 12 +4 more 0.9.9-16.1
  • LibVNCServer SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +6 more 0.9.1-156.1

suse advisories SUSE-SU-2015:2088-1SUSE-SU-2015:2088-2SUSE-SU-2015:2110-1

Is CVE-2014-6052 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2014-6052 updated cvss 4.3

libvncserver: NULL pointer dereference flaw in framebuffer setup

  • Red Hat Enterprise Linux Client (v. 7) libvncserver 0.9.9-9.el7_0.1 Red Hat Enterprise Linux Client Optional (v. 7) libvncserver-devel 0.9.9-9.el7_0.1, libvncserver-debuginfo 0.9.9-9.el7_0.1 Red Hat Enterprise Linux Desktop (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Desktop Optional (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Server (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Server (v. 7) libvncserver 0.9.9-9.el7_0.1
    +6 more products
    Red Hat Enterprise Linux Server Optional (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Server Optional (v. 7) libvncserver-devel 0.9.9-9.el7_0.1, libvncserver-debuginfo 0.9.9-9.el7_0.1 Red Hat Enterprise Linux Workstation (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Workstation (v. 7) libvncserver 0.9.9-9.el7_0.1 Red Hat Enterprise Linux Workstation Optional (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Workstation Optional (v. 7) libvncserver-devel 0.9.9-9.el7_0.1, libvncserver-debuginfo 0.9.9-9.el7_0.1
    fixed: vendor fix RHSA-2014:1826
  • Red Hat Enterprise Linux 5 kdenetwork Red Hat Enterprise Linux 6 kdenetwork, kdenetwork-libs Red Hat Enterprise Linux 7 kdenetwork, kdenetwork-kget, kdenetwork-krdc, kdenetwork-krfb, kdenetwork-common, kdenetwork-kdnssd, +6 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.76% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/newsoft/libvncserver/commit/85a778c0e45e87e35ee7199f1f25020648e8b812 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.