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Fencer Intel
medium 5.0

CVE-2014-6053 json

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts…

published 2014-12-15 11 y ago modified 2026-06-17 4 mo ago also EUVD-2014-5941

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.3%
EPSS 7.3% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

The rfbProcessClientNormalMessage function in libvncserver/rfbserver.c in LibVNCServer 0.9.9 and earlier does not properly handle attempts to send a large amount of ClientCutText data, which allows remote attackers to cause a denial of service (memory consumption or daemon crash) via a crafted message that is processed by using a single unchecked malloc.

Patch / fix

  • vino Debian 12 3.22.0-6
  • tightvnc Debian 14, Debian 13, Debian 12 1:1.3.9-9.1
  • libvncserver Debian 14, Debian 13, Debian 12 0.9.9+dfsg-6.1

debian advisories DEBIAN-CVE-2014-6053

  • krfb Ubuntu 14.04 LTS 4:4.13.3-0ubuntu1.1
  • vino Ubuntu 16.04 LTS 3.8.1-0ubuntu9.3
  • vino Ubuntu 18.04 LTS 3.22.0-3ubuntu1.1
  • vino Ubuntu 20.04 LTS 3.22.0-5ubuntu2.1
  • italc Ubuntu 16.04 LTS 1:2.0.2+dfsg1-4ubuntu0.1
  • libvncserver Ubuntu 14.04 LTS 0.9.9+dfsg-1ubuntu1.1
  • tightvnc Ubuntu Pro 14.04 LTS 1.3.9-6.5+deb8u1build0.14.04.1~esm1

ubuntu advisories UBUNTU-CVE-2014-6053

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
  • kdenetwork RHEL 7 7:4.10.5-8.el7_0
  • kdenetwork-kget RHEL 7 7:4.10.5-8.el7_0
  • kdenetwork-krdc RHEL 7 7:4.10.5-8.el7_0
  • kdenetwork-krfb RHEL 7 7:4.10.5-8.el7_0
  • kdenetwork-common RHEL 7 7:4.10.5-8.el7_0
  • kdenetwork-kdnssd RHEL 7 7:4.10.5-8.el7_0

red hat advisories RHSA-2014:1826RHSA-2014:1827

  • 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

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-2014-6053 updated cvss 6.0

libvncserver: server NULL pointer dereference flaw in ClientCutText message handling

  • Red Hat Enterprise Linux 5 kdenetwork
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) kdenetwork 4.10.5-8.el7_0, libvncserver 0.9.9-9.el7_0.1, kdenetwork-kget 4.10.5-8.el7_0, kdenetwork-krdc 4.10.5-8.el7_0, kdenetwork-krfb 4.10.5-8.el7_0, kdenetwork-common 4.10.5-8.el7_0, +4 more Red Hat Enterprise Linux Client Optional (v. 7) kdenetwork 4.10.5-8.el7_0, kdenetwork-kopete 4.10.5-8.el7_0, kdenetwork-kopete-libs 4.10.5-8.el7_0, kdenetwork-fileshare-samba 4.10.5-8.el7_0 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) kdenetwork 4.10.5-8.el7_0, libvncserver 0.9.9-9.el7_0.1, kdenetwork-kget 4.10.5-8.el7_0, kdenetwork-krdc 4.10.5-8.el7_0, kdenetwork-krfb 4.10.5-8.el7_0, kdenetwork-common 4.10.5-8.el7_0, +6 more
    +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) kdenetwork 4.10.5-8.el7_0, kdenetwork-fileshare-samba 4.10.5-8.el7_0 Red Hat Enterprise Linux Workstation (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Workstation (v. 7) kdenetwork 4.10.5-8.el7_0, libvncserver 0.9.9-9.el7_0.1, kdenetwork-kget 4.10.5-8.el7_0, kdenetwork-krdc 4.10.5-8.el7_0, kdenetwork-krfb 4.10.5-8.el7_0, kdenetwork-common 4.10.5-8.el7_0, +6 more Red Hat Enterprise Linux Workstation Optional (v. 6) libvncserver 0.9.7-7.el6_6.1 Red Hat Enterprise Linux Workstation Optional (v. 7) kdenetwork 4.10.5-8.el7_0, kdenetwork-fileshare-samba 4.10.5-8.el7_0
    fixed: vendor fix RHSA-2014:1826
  • Red Hat Enterprise Linux 6 kdenetwork, kdenetwork-libs
    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

7.25% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-19 Data Processing Errors

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.