CVE-2018-5188

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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.9%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Memory safety bugs present in Firefox 60, Firefox ESR 60, and Firefox ESR 52.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation4% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
3.9%
EPSS %ILE
90th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 18, 2018

Last Modified

November 21, 2024

Advisory Details (10)

Auto-updated Sep 28, 2026
Patch available. Sources: redhat.
generic

Mozilla Thunderbird: Multiple vulnerabilities (GLSA 201811-13) — Gentoo security

https://security.gentoo.org/glsa/201811-13
generic

Mozilla Firefox: Multiple vulnerabilities (GLSA 201810-01) — Gentoo security

https://security.gentoo.org/glsa/201810-01
generic Patch Available

[SECURITY] [DLA 1425-1] thunderbird security update

https://lists.debian.org/debian-lts-announce/2018/07/msg00013.html
generic Patch Available

[SECURITY] [DLA 1406-1] firefox-esr security update

https://lists.debian.org/debian-lts-announce/2018/06/msg00014.html
generic

Client Challenge

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1456189%2C1456975%2C1465898%2C1392739%2C1451297%2C1464063%2C1437842%2C1442722%2C1452576%2C1450688%2C1458264%2C1458270%2C1465108%2C1464829%2C1464079%2C1463494%2C1458048
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:2252
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:2251
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:2113
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:2112
generic

CVE-2018-12359 - PSIRT.COM

http://www.securityfocus.com/bid/104555

Vendor Advisories for CVE-2018-5188(4)

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

Patch Availability(7)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuxul-ext-lightning (1:52.9.1+build3-0ubuntu0.16.04.1) @ xenial2026-05-28ubuntu
ubuntufirefox-testsuite (61.0+build3-0ubuntu0.16.04.2) @ xenial2026-05-28ubuntu
ubuntulibmozjs-52-dev (52.9.1-0ubuntu0.18.04.1) @ bionic2026-05-28ubuntu
redhatthunderbird-0:52.9.1-1.el7_52018-07-24redhat
redhatthunderbird-0:52.9.1-1.el62018-07-24redhat
redhatfirefox-0:60.1.0-4.el7_52018-06-28redhat
redhatfirefox-0:60.1.0-5.el62018-06-28redhat

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.

Affected Packages

(12 across 6 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 52.9.0esr-1: fixed in 52.9.0esr-1
—
thunderbird—
  • every version up to 1:52.9.0-1: fixed in 1:52.9.0-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 52.9.0esr-1: fixed in 52.9.0esr-1
—
thunderbird—
  • every version up to 1:52.9.0-1: fixed in 1:52.9.0-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 52.9.0esr-1: fixed in 52.9.0esr-1
—
thunderbird—
  • every version up to 1:52.9.0-1: fixed in 1:52.9.0-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 52.9.0esr-1: fixed in 52.9.0esr-1
—
thunderbird—
  • every version up to 1:52.9.0-1: fixed in 1:52.9.0-1
—
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.0.1esr-1 ... 52.8.1esr-2 (97 versions)
  • every version up to 52.9.0esr-1~deb8u1: fixed in 52.9.0esr-1~deb8u1
—
thunderbird1.5-4 ... 1:52.9.0-1 (39 versions)
  • every version up to 1:52.9.1-1~deb8u1: fixed in 1:52.9.1-1~deb8u1
—
Debian:9(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.9.0esr-1 ... 52.9.0esr-1~deb8u1 (60 versions)
  • every version up to 52.9.0esr-1~deb9u1: fixed in 52.9.0esr-1~deb9u1
—
thunderbird1.5-4 ... 1:52.9.1-1~deb8u1 (40 versions)
  • every version up to 1:52.9.1-1~deb9u1: fixed in 1:52.9.1-1~deb9u1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

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 7× in last 7d / 23× 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.

Showing the most recent 100 of 158 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:21 UTCEPSS rescore
  4. 2026-10-01 19:44 UTCEPSS rescore
  5. 2026-09-30 14:59 UTCEPSS rescore
  6. 2026-09-30 10:02 UTCEG score recompute
  7. 2026-09-29 15:12 UTCEPSS rescore
  8. 2026-09-28 17:42 UTCOSV refresh
  9. 2026-09-28 13:46 UTCEPSS rescore
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  11. 2026-09-26 15:53 UTCEPSS rescore
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  20. 2026-09-11 14:48 UTCEPSS rescore
  21. 2026-09-11 09:32 UTCEPSS rescore
  22. 2026-09-08 22:12 UTCOSV refresh
  23. 2026-09-06 13:44 UTCEPSS rescore
  24. 2026-09-04 13:56 UTCEPSS rescore
  25. 2026-09-04 05:02 UTCEPSS rescore
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  1. 2026-09-02 14:07 UTCEPSS rescore
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  3. 2026-08-30 19:13 UTCEPSS rescore
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  5. 2026-08-28 21:36 UTCEPSS rescore
  6. 2026-08-27 14:21 UTCEPSS rescore
  7. 2026-08-26 14:42 UTCEPSS rescore
  8. 2026-08-25 13:45 UTCEPSS rescore
  9. 2026-08-24 14:11 UTCEPSS rescore
  10. 2026-08-22 07:37 UTCOSV refresh
  11. 2026-08-21 23:45 UTCEPSS rescore
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  13. 2026-08-19 17:00 UTCEPSS rescore
  14. 2026-08-18 13:44 UTCEPSS rescore
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  23. 2026-08-07 16:23 UTCEPSS rescore
  24. 2026-08-06 13:42 UTCEPSS rescore
  25. 2026-08-06 10:40 UTCOSV refresh
  26. 2026-08-04 15:05 UTCEPSS rescore
  27. 2026-08-04 10:33 UTCEPSS rescore
  28. 2026-08-03 10:31 UTCEPSS rescore
  29. 2026-08-02 02:23 UTCEPSS rescore
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  31. 2026-07-30 16:24 UTCEPSS rescore
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  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 14:15 UTCEPSS rescore
  42. 2026-07-23 01:36 UTCEG score recompute
  43. 2026-07-22 22:16 UTCEG score recompute
  44. 2026-07-22 14:05 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-21 03:47 UTCOSV refresh
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-20 17:04 UTCEPSS rescore
  49. 2026-07-19 14:28 UTCEPSS rescore
  50. 2026-07-19 14:28 UTCEPSS rescore
  51. 2026-07-19 02:26 UTCEPSS rescore
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  70. 2026-07-03 22:56 UTCOSV refresh
  71. 2026-07-01 15:03 UTCEPSS rescore
  72. 2026-07-01 15:03 UTCEPSS rescore
  73. 2026-06-30 23:20 UTCEPSS rescore
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  75. 2026-06-29 14:03 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-5188?
CVE-2018-5188 is a critical vulnerability published on October 18, 2018. Memory safety bugs present in Firefox 60, Firefox ESR 60, and Firefox ESR 52.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60, Thunderbird <…
When was CVE-2018-5188 disclosed?
CVE-2018-5188 was first published on October 18, 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-2018-5188 actively exploited?
CVE-2018-5188 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.9% probability of exploitation in the next 30 days (90th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-5188?
CVE-2018-5188 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-5188?
A fix for CVE-2018-5188 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2018-5188 are linked in the Vendor Advisories panel on this page.

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