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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium 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%
Exploitation3% × 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
3.4%
EPSS %ILE
88th
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 25, 2025

Advisory Details (10)

Auto-updated Oct 1, 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

CVE-2018-12376 - PSIRT.COM

http://www.securityfocus.com/bid/105280
generic
http://www.securitytracker.com/id/1041610

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 / EcosystemFix (by version range) / 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.

Affected Packages

(11 across 6 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.2.0esr-1: fixed in 60.2.0esr-1
—
thunderbird—
  • every version up to 1:60.2.1-1: fixed in 1:60.2.1-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.2.0esr-1: fixed in 60.2.0esr-1
—
thunderbird—
  • every version up to 1:60.2.1-1: fixed in 1:60.2.1-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.2.0esr-1: fixed in 60.2.0esr-1
—
thunderbird—
  • every version up to 1:60.2.1-1: fixed in 1:60.2.1-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.2.0esr-1: fixed in 60.2.0esr-1
—
thunderbird—
  • every version up to 1:60.2.1-1: fixed in 1:60.2.1-1
—
Debian:9(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.9.0esr-1 ... 60.2.0esr-1~deb9u1 (70 versions)
  • every version up to 60.2.0esr-1~deb9u2: fixed in 60.2.0esr-1~deb9u2
—
thunderbird1.5-4 ... 1:60.2.1-1 (57 versions)
  • every version up to 1:60.2.1-2~deb9u1: fixed in 1:60.2.1-2~deb9u1
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
thunderbird1.5-4 ... 1:60.2.1-2~deb9u1 (58 versions)
  • every version up to 1:60.3.0-1~deb8u1: fixed in 1:60.3.0-1~deb8u1
—

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 5× in last 7d / 27× 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 166 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. 2026-09-30 14:59 UTCEPSS rescore
  5. 2026-09-30 09:52 UTCEG score recompute
  6. 2026-09-28 18:13 UTCOSV refresh
  7. 2026-09-28 13:45 UTCEPSS rescore
  8. 2026-09-27 13:40 UTCEPSS rescore
  9. 2026-09-27 13:40 UTCEPSS rescore
  10. 2026-09-26 15:53 UTCEPSS rescore
  11. 2026-09-26 00:19 UTCEPSS rescore
  12. 2026-09-24 13:59 UTCEPSS rescore
  13. 2026-09-23 13:42 UTCEPSS rescore
  14. 2026-09-21 20:27 UTCEPSS rescore
  15. 2026-09-19 15:36 UTCEPSS rescore
  16. 2026-09-18 19:22 UTCEPSS rescore
  17. 2026-09-17 19:22 UTCEPSS rescore
  18. 2026-09-16 14:03 UTCEPSS rescore
  19. 2026-09-16 05:06 UTCEPSS rescore
  20. 2026-09-15 03:05 UTCEPSS rescore
  21. 2026-09-13 16:42 UTCEPSS rescore
  22. 2026-09-12 14:56 UTCEPSS rescore
  23. 2026-09-11 14:47 UTCEPSS rescore
  24. 2026-09-10 09:27 UTCEPSS rescore
  25. 2026-09-08 23:02 UTCOSV refresh
Show 75 more
  1. 2026-09-07 15:57 UTCEPSS rescore
  2. 2026-09-06 13:43 UTCEPSS rescore
  3. 2026-09-05 15:24 UTCEPSS rescore
  4. 2026-09-04 13:56 UTCEPSS rescore
  5. 2026-09-04 05:02 UTCEPSS rescore
  6. 2026-09-02 14:07 UTCEPSS rescore
  7. 2026-09-02 14:07 UTCEPSS rescore
  8. 2026-09-01 13:49 UTCEPSS rescore
  9. 2026-09-01 03:31 UTCEPSS rescore
  10. 2026-08-30 19:13 UTCEPSS rescore
  11. 2026-08-28 21:36 UTCEPSS rescore
  12. 2026-08-27 14:21 UTCEPSS rescore
  13. 2026-08-26 14:41 UTCEPSS rescore
  14. 2026-08-25 13:44 UTCEPSS rescore
  15. 2026-08-23 00:14 UTCEPSS rescore
  16. 2026-08-22 08:07 UTCOSV refresh
  17. 2026-08-21 23:44 UTCEPSS rescore
  18. 2026-08-20 22:51 UTCEPSS rescore
  19. 2026-08-19 17:00 UTCEPSS rescore
  20. 2026-08-18 13:43 UTCEPSS rescore
  21. 2026-08-17 13:42 UTCEPSS rescore
  22. 2026-08-16 14:51 UTCEPSS rescore
  23. 2026-08-16 02:10 UTCEPSS rescore
  24. 2026-08-15 01:26 UTCEPSS rescore
  25. 2026-08-13 21:56 UTCEPSS rescore
  26. 2026-08-12 13:46 UTCEPSS rescore
  27. 2026-08-11 13:36 UTCEPSS rescore
  28. 2026-08-09 13:42 UTCEPSS rescore
  29. 2026-08-08 16:32 UTCEPSS rescore
  30. 2026-08-07 16:22 UTCEPSS rescore
  31. 2026-08-06 13:42 UTCEPSS rescore
  32. 2026-08-06 13:42 UTCEPSS rescore
  33. 2026-08-06 11:10 UTCOSV refresh
  34. 2026-08-04 15:05 UTCEPSS rescore
  35. 2026-08-02 02:23 UTCEPSS rescore
  36. 2026-08-01 04:12 UTCEPSS rescore
  37. 2026-07-30 16:24 UTCEPSS rescore
  38. 2026-07-30 01:27 UTCEPSS rescore
  39. 2026-07-28 15:32 UTCEPSS rescore
  40. 2026-07-26 14:51 UTCEPSS rescore
  41. 2026-07-26 14:51 UTCEPSS rescore
  42. 2026-07-24 14:14 UTCEPSS rescore
  43. 2026-07-23 14:15 UTCEPSS rescore
  44. 2026-07-23 14:15 UTCEPSS rescore
  45. 2026-07-23 01:33 UTCEG score recompute
  46. 2026-07-22 22:13 UTCEG score recompute
  47. 2026-07-22 14:04 UTCEPSS rescore
  48. 2026-07-21 15:21 UTCEPSS rescore
  49. 2026-07-21 04:17 UTCOSV refresh
  50. 2026-07-20 17:04 UTCEPSS rescore
  51. 2026-07-20 17:04 UTCEPSS rescore
  52. 2026-07-19 14:28 UTCEPSS rescore
  53. 2026-07-19 02:26 UTCEPSS rescore
  54. 2026-07-19 02:26 UTCEPSS rescore
  55. 2026-07-16 16:59 UTCEPSS rescore
  56. 2026-07-16 16:59 UTCEPSS rescore
  57. 2026-07-15 16:55 UTCEPSS rescore
  58. 2026-07-15 01:56 UTCEPSS rescore
  59. 2026-07-13 22:26 UTCEPSS rescore
  60. 2026-07-13 06:10 UTCEPSS rescore
  61. 2026-07-12 05:43 UTCEPSS rescore
  62. 2026-07-11 08:24 UTCEPSS rescore
  63. 2026-07-09 19:06 UTCEPSS rescore
  64. 2026-07-08 15:11 UTCEPSS rescore
  65. 2026-07-07 13:42 UTCEPSS rescore
  66. 2026-07-07 13:42 UTCEPSS rescore
  67. 2026-07-06 16:24 UTCEPSS rescore
  68. 2026-07-06 16:24 UTCEPSS rescore
  69. 2026-07-06 02:20 UTCEPSS rescore
  70. 2026-07-05 02:27 UTCEPSS rescore
  71. 2026-07-04 06:28 UTCEPSS rescore
  72. 2026-07-03 23:26 UTCOSV refresh
  73. 2026-07-02 16:54 UTCEPSS rescore
  74. 2026-07-01 15:03 UTCEPSS rescore
  75. 2026-07-01 15:03 UTCEPSS rescore

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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 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 3.4% probability of exploitation in the next 30 days (88th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2018-12377 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2018-12377 are linked in the Vendor Advisories panel on this page.

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