CVE-2024-8385

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2024-09-03. 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: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Thunderbird < 128.2.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

September 3, 2024

Last Modified

September 6, 2024

Advisory Details (4)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 128.2 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2024-43/
generic

Security Vulnerabilities fixed in Firefox ESR 128.2 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2024-40/
generic

Security Vulnerabilities fixed in Firefox 130 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2024-39/
generic

1911909 - (CVE-2024-8385) [wasm-gc] WASM type confusion due to broken js::wasm::ArrayType::canBeSubtypeOf() check

https://bugzilla.mozilla.org/show_bug.cgi?id=1911909

Patch Availability(18)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-mozsymbols (130.0+build2-0ubuntu0.20.04.1) @ focal2026-05-23ubuntu
redhatfirefox-0:128.2.0-1.el8_22024-09-19redhat
redhatfirefox-0:128.2.0-1.el8_62024-09-19redhat
redhatfirefox-0:128.2.0-1.el8_82024-09-19redhat
redhatfirefox-0:128.2.0-1.el8_42024-09-19redhat
redhatthunderbird-0:128.2.0-1.el8_62024-09-19redhat
redhatfirefox-0:128.2.0-1.el7_92024-09-19redhat
redhatfirefox-0:128.2.0-1.el9_02024-09-18redhat
redhatfirefox-0:128.2.0-1.el9_22024-09-18redhat
redhatthunderbird-0:128.2.0-1.el8_42024-09-17redhat
redhatthunderbird-0:128.2.0-1.el8_82024-09-17redhat
redhatthunderbird-0:128.2.0-1.el9_02024-09-17redhat
redhatthunderbird-0:128.2.0-1.el9_22024-09-17redhat
redhatthunderbird-0:128.2.0-1.el8_22024-09-17redhat
redhatfirefox-0:128.2.0-1.el9_42024-09-16redhat
redhatthunderbird-0:128.2.0-1.el8_102024-09-16redhat
redhatfirefox-0:128.2.0-1.el8_102024-09-16redhat
redhatthunderbird-0:128.2.0-1.el9_42024-09-16redhat

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

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
thunderbird—1:128.2.0esr-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
thunderbird—1:128.2.0esr-1—

Weakness Classification(1)

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

All Vendor Advisories

(18)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 30× 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. 2026-09-19 15:41 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-18 19:26 UTCEPSS rescore
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  19. 2026-09-01 12:04 UTCOSV refresh
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  11. 2026-08-15 11:37 UTCOSV refresh
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  27. 2026-07-31 00:50 UTCOSV refresh
  28. 2026-07-30 16:26 UTCEPSS rescore
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  36. 2026-07-23 02:46 UTCEG score recompute
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  52. 2026-07-13 22:29 UTCEPSS rescore
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  54. 2026-07-13 09:07 UTCOSV refresh
  55. 2026-07-13 06:12 UTCEPSS rescore
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  74. 2026-06-28 04:55 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2024-8385?
CVE-2024-8385 is a critical vulnerability published on September 3, 2024. A difference in the handling of StructFields and ArrayTypes in WASM could be used to trigger an exploitable type confusion vulnerability. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Thunderbird < 128.2.
When was CVE-2024-8385 disclosed?
CVE-2024-8385 was first published in the National Vulnerability Database on September 3, 2024, with the most recent update on September 6, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-8385 actively exploited?
CVE-2024-8385 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.8% of all scored CVEs.
What is the CVSS score of CVE-2024-8385?
CVE-2024-8385 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2024-8385?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-8385, 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

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