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Fencer Vulns
critical 9.8

CVE-2017-12184 json

xorg-x11-server before 1.19.5 was missing length validation in XINERAMA extension allowing malicious X client to cause X server to crash or…

published 2018-01-24 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-3759

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.2%
EPSS 4.2% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

xorg-x11-server before 1.19.5 was missing length validation in XINERAMA extension allowing malicious X client to cause X server to crash or possibly execute arbitrary code.

Patch / fix

  • x.org x_server 1.19.5
  • xorg-server Debian 14, Debian 13, Debian 12 2:1.19.5-1

debian advisories DEBIAN-CVE-2017-12184

  • xorg-server Ubuntu 14.04 LTS 2:1.15.1-0ubuntu2.11
  • xorg-server Ubuntu 16.04 LTS 2:1.18.4-0ubuntu0.7
  • xorg-server-hwe-16.04 Ubuntu 16.04 LTS 2:1.19.3-1ubuntu1~16.04.4
  • xorg-server-lts-xenial Ubuntu 14.04 LTS 2:1.18.3-1ubuntu2.3~trusty4

ubuntu advisories UBUNTU-CVE-2017-12184

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

  • xorg-x11-server SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +6 more 7.6_1.18.3-76.15.2
  • xorg-x11-server SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 7.4-27.122.16.1

suse advisories SUSE-SU-2017:3047-1SUSE-SU-2017:3025-1

  • xorg-server Alpine 3.24, Alpine 3.23, Alpine 3.22 +16 more 1.19.5-r0

alpine advisories ALPINE-CVE-2017-12184

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

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-2017-12184 updated cvss 7.5

xorg-x11-server: unvalidated lengths in XINERAMA extension

  • Red Hat Enterprise Linux 5 xorg-x11-server Red Hat Enterprise Linux 6 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +2 more Red Hat Enterprise Linux 7 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +3 more
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 9 xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, xorg-x11-server-Xnest, xorg-x11-server-common, +2 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

4.17% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

Affected products

  • The X.Org Foundation xorg-x11-server

Classification

Weakness
  • CWE-391 DEPRECATED: Unchecked Error Condition
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns 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.