CVE-2018-12387

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 10%CVSS: 9.1Exploit: Elevated riskExposed: 0

A fix is available — apply it.

A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity91% × 45%
Exploitation10% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
10%
EPSS %ILE
95%
KEV
Not listed

Published

October 18, 2018

Last Modified

November 25, 2025

Advisory Details (8)

Auto-updated Aug 1, 2026
Patch available. Sources: redhat.
generic

SecurityFocus

http://www.securityfocus.com/bid/105460
generic

Security vulnerabilities fixed in Firefox 62.0.3 and Firefox ESR 60.2.2 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2018-24/
generic

[SECURITY] [DSA 4310-1] firefox-esr security update

https://www.debian.org/security/2018/dsa-4310
generic

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

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

1493903 - (CVE-2018-12387) Infoleak bug from Hack2Win

https://bugzilla.mozilla.org/show_bug.cgi?id=1493903
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2018:2884
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:2881
generic
http://www.securitytracker.com/id/1041770

Vendor Advisories for CVE-2018-12387(2)

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
ubuntufirefox-testsuite (62.0.3+build1-0ubuntu0.16.04.2) @ xenial2026-05-28ubuntu
redhatfirefox-0:60.2.2-1.el62018-10-08redhat
redhatfirefox-0:60.2.2-1.el7_52018-10-08redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.2.2esr-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.2.2esr-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.2.2esr-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.2.2esr-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 60.2.1esr-1~deb9u1 (74 versions)60.2.2esr-1~deb9u1—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 6× in last 7d / 28× 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 137 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-12387?
CVE-2018-12387 is a critical vulnerability published on October 18, 2018. A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content…
When was CVE-2018-12387 disclosed?
CVE-2018-12387 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-2018-12387 actively exploited?
CVE-2018-12387 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10% probability of exploitation in the next 30 days, which ranks it in the top 4.8% of all scored CVEs.
What is the CVSS score of CVE-2018-12387?
CVE-2018-12387 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2018-12387?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12387, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-12387

Explore →

Is Your Infrastructure Affected by CVE-2018-12387?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs