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
Trending — 3 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 10%CVSS: 9.1Exploit: NoneExposed: 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
95.0%
KEV
Not listed

Published

October 18, 2018

Last Modified

November 25, 2025

Advisory Details (8)

Auto-updated Jul 19, 2026
Patch available. Sources: redhat.
generic
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.

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 12× in last 7d / 40× 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 03:47 UTCOSV refresh
  6. 2026-07-20 17:04 UTCEPSS rescore
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  1. 2026-07-03 22:56 UTCOSV refresh
  2. 2026-07-02 16:54 UTCEPSS rescore
  3. 2026-07-01 15:03 UTCEPSS rescore
  4. 2026-07-01 15:03 UTCEPSS rescore
  5. 2026-06-30 23:19 UTCEPSS rescore
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  7. 2026-06-28 14:04 UTCEPSS rescore
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  27. 2026-06-15 11:13 UTCOSV refresh
  28. 2026-06-13 22:58 UTCEPSS rescore
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  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 01:51 UTCEG score recompute
  55. 2026-05-28 01:51 UTCVendor advisory
  56. 2026-05-28 01:51 UTCGHSA enrichment
  57. 2026-05-27 13:38 UTCEPSS rescore
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  59. 2026-05-26 07:17 UTCEPSS rescore
  60. 2026-05-26 07:17 UTCEPSS rescore

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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 95.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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