CVE-2018-12377

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: 3%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

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%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
87.4%
KEV
Not listed

Published

October 18, 2018

Last Modified

November 25, 2025

Advisory Details (10)

Auto-updated May 26, 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 1575-1] thunderbird security update

https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
generic

1470260 - (CVE-2018-12377) heap-use-after-free in mozilla::RefreshDriverTimer::TickRefreshDrivers

https://bugzilla.mozilla.org/show_bug.cgi?id=1470260
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:3458
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:3403
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:2693
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:2692
generic
http://www.securitytracker.com/id/1041610
generic
http://www.securityfocus.com/bid/105280

Vendor Advisories for CVE-2018-12377(2)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-testsuite (62.0+build2-0ubuntu0.16.04.3) @ xenial2026-05-28ubuntu
ubuntuxul-ext-lightning (1:60.2.1+build1-0ubuntu0.16.04.4) @ xenial2026-05-28ubuntu
redhatthunderbird-0:60.2.1-4.el7_52018-11-05redhat
redhatthunderbird-0:60.2.1-5.el62018-10-30redhat
redhatfirefox-0:60.2.0-1.el62018-09-12redhat
redhatfirefox-0:60.2.0-1.el7_52018-09-12redhat

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

(4)

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 12× in last 7d / 43× 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. 2026-07-23 01:33 UTCEG score recompute
  2. 2026-07-22 22:13 UTCEG score recompute
  3. 2026-07-22 14:04 UTCEPSS rescore
  4. 2026-07-21 15:21 UTCEPSS rescore
  5. 2026-07-21 04:17 UTCOSV refresh
  6. 2026-07-20 17:04 UTCEPSS rescore
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  1. 2026-07-05 02:27 UTCEPSS rescore
  2. 2026-07-04 06:28 UTCEPSS rescore
  3. 2026-07-03 23:26 UTCOSV refresh
  4. 2026-07-02 16:54 UTCEPSS rescore
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  7. 2026-06-30 23:19 UTCEPSS rescore
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  32. 2026-06-15 11:13 UTCOSV refresh
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  63. 2026-05-28 01:52 UTCEG score recompute
  64. 2026-05-28 01:52 UTCVendor advisory
  65. 2026-05-28 01:51 UTCGHSA enrichment
  66. 2026-05-27 13:38 UTCEPSS rescore
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  72. 2026-05-26 04:46 UTCOSV refresh

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Frequently asked(5)

What is CVE-2018-12377?
CVE-2018-12377 is a critical vulnerability published on October 18, 2018. A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird <…
When was CVE-2018-12377 disclosed?
CVE-2018-12377 was first published in the National Vulnerability Database on October 18, 2018, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-12377 actively exploited?
CVE-2018-12377 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-12377?
CVE-2018-12377 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-12377?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12377, 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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