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Fencer Intel
critical 9.8

CVE-2018-7225 json

An issue was discovered in LibVNCServer through 0.9.11.

published 2018-02-19 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-18964

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.1%
EPSS 6.1% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.

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 0.9.11+dfsg-1.1

debian advisories DEBIAN-CVE-2018-7225

  • 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
  • italc Ubuntu 18.04 LTS 1:3.0.3+dfsg1-3ubuntu0.1
  • libvncserver Ubuntu 14.04 LTS 0.9.9+dfsg-1ubuntu1.3
  • libvncserver Ubuntu 16.04 LTS 0.9.10+dfsg-3ubuntu0.16.04.2
  • tightvnc Ubuntu Pro 14.04 LTS 1.3.9-6.5+deb8u1build0.14.04.1~esm1

ubuntu advisories UBUNTU-CVE-2018-7225

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 7 0.9.9-12.el7_5

red hat advisories RHSA-2018:1055

  • LibVNCServer SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 0.9.1-160.3.1
  • LibVNCServer SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +4 more 0.9.9-17.5.1

suse advisories SUSE-SU-2018:0875-1SUSE-SU-2018:0830-1

  • libvncserver Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 0.9.11-r2
  • libvncserver Alpine 3.6, Alpine 3.5 0.9.11-r1

alpine advisories ALPINE-CVE-2018-7225

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libvncserver Arch Linux 0.9.12-1

arch linux advisories AVG-628

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-2018-7225 updated cvss 5.4

libvncserver: Improper input sanitization in rfbProcessClientNormalMessage in rfbserver.c

  • Red Hat Enterprise Linux 6 libvncserver
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) libvncserver 0.9.9-12.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) libvncserver-devel 0.9.9-12.el7_5, libvncserver-debuginfo 0.9.9-12.el7_5 Red Hat Enterprise Linux Server (v. 7) libvncserver 0.9.9-12.el7_5 Red Hat Enterprise Linux Server Optional (v. 7) libvncserver-devel 0.9.9-12.el7_5, libvncserver-debuginfo 0.9.9-12.el7_5 Red Hat Enterprise Linux Workstation (v. 7) libvncserver 0.9.9-12.el7_5 Red Hat Enterprise Linux Workstation Optional (v. 7) libvncserver-devel 0.9.9-12.el7_5, libvncserver-debuginfo 0.9.9-12.el7_5
    fixed: vendor fix RHSA-2018:1055

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

6.11% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • openwall.com http://www.openwall.com/lists/oss-security/2018/02/18/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.