CVE-2018-14600

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 9%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
94.9%
KEV
Not listed

Published

August 24, 2018

Last Modified

November 21, 2024

Advisory Details (9)

Auto-updated Jul 5, 2026
Patch available. Sources: redhat.
generic

X.Org X11 library: Multiple vulnerabilities (GLSA 201811-01) — Gentoo security

https://security.gentoo.org/glsa/201811-01
generic

[ANNOUNCE] libX11 1.6.6

https://lists.x.org/archives/xorg-announce/2018-August/002916.html
generic Patch Available

[SECURITY] [DLA 1482-1] libx11 security update

https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html
generic

Fixed out of boundary write (CVE-2018-14600). - xorg/lib/libX11 - libX11 GIT Repository (mirrored from https://gitlab.freedesktop.org/xorg/lib/libx11)

https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=dbf72805fd9d7b1846fe9a11b46f3994bfc27fea
generic

1102068 – (CVE-2018-14600) VUL-0: CVE-2018-14600: libX11,xorg-x11-libX11, xorg-x11: out of boundary write in XListExtensions

https://bugzilla.suse.com/show_bug.cgi?id=1102068
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2019:2079
generic
http://www.securitytracker.com/id/1041543
generic
http://www.securityfocus.com/bid/105177
generic

oss-security - X.Org security advisory: August 21, 2018

http://www.openwall.com/lists/oss-security/2018/08/21/6

Vendor Advisories for CVE-2018-14600(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibx11-xcb1 (2:1.6.3-1ubuntu2.1) @ xenial2026-05-28ubuntu
ubuntulibx11-dev (2:1.4.99.1-0ubuntu2.4) @ precise2026-05-28ubuntu
redhatxorg-x11-server-0:1.20.4-7.el72019-08-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:13 UTCEG score recompute
  2. 2026-07-22 14:04 UTCEPSS rescore
  3. 2026-07-21 15:21 UTCEPSS rescore
  4. 2026-07-21 06:47 UTCOSV refresh
  5. 2026-07-20 17:04 UTCEPSS rescore
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  7. 2026-07-19 14:28 UTCEPSS rescore
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  22. 2026-07-05 02:27 UTCEPSS rescore
  23. 2026-07-04 06:28 UTCEPSS rescore
  24. 2026-07-04 01:56 UTCOSV refresh
  25. 2026-07-02 16:54 UTCEPSS rescore
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  1. 2026-07-01 15:03 UTCEPSS rescore
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  3. 2026-06-30 23:19 UTCEPSS rescore
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  5. 2026-06-28 14:04 UTCEPSS rescore
  6. 2026-06-28 04:53 UTCEPSS rescore
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  8. 2026-06-27 03:06 UTCEPSS rescore
  9. 2026-06-25 13:47 UTCEPSS rescore
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  11. 2026-06-24 14:02 UTCEPSS rescore
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  24. 2026-06-16 17:50 UTCEPSS rescore
  25. 2026-06-16 17:50 UTCEPSS rescore
  26. 2026-06-15 17:45 UTCEPSS rescore
  27. 2026-06-15 14:13 UTCOSV refresh
  28. 2026-06-14 23:14 UTCEPSS rescore
  29. 2026-06-14 23:14 UTCEPSS rescore
  30. 2026-06-13 22:58 UTCEPSS rescore
  31. 2026-06-13 22:58 UTCEPSS rescore
  32. 2026-06-12 23:09 UTCEPSS rescore
  33. 2026-06-11 13:57 UTCEPSS rescore
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  40. 2026-06-05 06:08 UTCEPSS rescore
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  42. 2026-06-04 13:10 UTCEPSS rescore
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  44. 2026-06-02 20:11 UTCEPSS rescore
  45. 2026-06-02 20:11 UTCEPSS rescore
  46. 2026-06-01 13:49 UTCEPSS rescore
  47. 2026-05-31 22:29 UTCEPSS rescore
  48. 2026-05-31 22:28 UTCEPSS rescore
  49. 2026-05-31 00:14 UTCEPSS rescore
  50. 2026-05-31 00:14 UTCEPSS rescore
  51. 2026-05-29 13:41 UTCEPSS rescore
  52. 2026-05-28 13:42 UTCEPSS rescore
  53. 2026-05-28 13:42 UTCEPSS rescore
  54. 2026-05-28 03:48 UTCEG score recompute
  55. 2026-05-28 03:48 UTCVendor advisory
  56. 2026-05-28 03:48 UTCGHSA enrichment
  57. 2026-05-27 13:38 UTCEPSS rescore
  58. 2026-05-27 13:38 UTCEPSS rescore
  59. 2026-05-26 13:42 UTCEPSS rescore
  60. 2026-05-26 13:42 UTCEPSS rescore
  61. 2026-05-26 07:17 UTCEPSS rescore
  62. 2026-05-26 07:17 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-14600?
CVE-2018-14600 is a critical vulnerability published on August 24, 2018. An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.
When was CVE-2018-14600 disclosed?
CVE-2018-14600 was first published in the National Vulnerability Database on August 24, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-14600 actively exploited?
CVE-2018-14600 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 94.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-14600?
CVE-2018-14600 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-14600?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-14600, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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