Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2018-14599

32
FAUCET Score

CVE-2018-14599 is an off-by-one error vulnerability in the XListExtensions function of libX11 through version 1.6.5, affecting various Linux distributions including Canonical, Debian, Fedora, Red Hat, and X.Org. This critical vulnerability, with a CVSS score of 9.8, can be exploited remotely with low complexity, potentially leading to Denial of Service or other unspecified impacts. Despite its high severity, there is no known active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.6.5CPE matchmatch criteria
cpe:2.3:a:x.org:libx11:*:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
18.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.80%
Probability of exploitation in next 30 days
EPSS Percentile
91.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0480 is in the 85th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (9)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: gdm-1:3.28.2-16.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libX11-0:1.6.7-2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libxkbcommon-0:0.7.1-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: mesa-libGLw-0:8.0.0-5.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xorg-x11-drv-ati-0:19.0.1-2.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xorg-x11-drv-vesa-0:2.4.0-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xorg-x11-drv-wacom-0:0.36.1-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xorg-x11-server-0:1.20.4-7.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libX11

Vendor Advisories (1)

redhatCVE-2018-14599Moderate

libX11: Off-by-one error in XListExtensions in ListExt.c

Aug 21, 2018

References

access.redhat.com / errata/RHSA-2019:2079
Third Party Advisory
bugzilla.suse.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
cgit.freedesktop.org / xorg/lib/libX11/commit
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2018/08/msg00030.html
Third Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB7SDV6GO4F
lists.x.org / archives/xorg-announce/2018-August/002916.html
Third Party Advisory
security.gentoo.org / glsa/201811-01
Third Party Advisory
usn.ubuntu.com / 3758-1
Third Party Advisory
usn.ubuntu.com / 3758-2
Third Party Advisory
openwall.com / lists/oss-security/2018/08/21/6
Mailing ListThird Party Advisory
securityfocus.com / bid/105177
Third Party AdvisoryVDB Entry
securitytracker.com / id/1041543
Third Party AdvisoryVDB Entry