CVE-2024-29943

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2024-03-22. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 23%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

An attacker was able to perform an out-of-bounds read or write on a JavaScript object by fooling range-based bounds check elimination. This vulnerability affects Firefox < 124.0.1.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
23%
EPSS %ILE
98%
KEV
Not listed

Published

March 22, 2024

Last Modified

April 1, 2025

Advisory Details (3)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Firefox 124.0.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2024-15/
generic

1886849 - (CVE-2024-29943) [pwn2own-2024] MObjectKeysLength::computeRange is incorrect

https://bugzilla.mozilla.org/show_bug.cgi?id=1886849
generic

oss-security - Firefox 124.0.1 fixes two critical JavaScript engine vulnerabilities

http://www.openwall.com/lists/oss-security/2024/03/23/1

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-mozsymbols (124.0.1+build1-0ubuntu0.20.04.1) @ focal2026-05-24ubuntu

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(2)

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

All Vendor Advisories

(2)

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 / 36× 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 110 total refreshes for this CVE.

  1. 2026-08-07 16:25 UTCEPSS rescore
  2. 2026-08-06 13:45 UTCEPSS rescore
  3. 2026-08-05 19:16 UTCEPSS rescore
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  19. 2026-07-23 02:35 UTCEG score recompute
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  1. 2026-07-19 02:28 UTCEPSS rescore
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  5. 2026-07-15 16:56 UTCEPSS rescore
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  7. 2026-07-13 22:28 UTCEPSS rescore
  8. 2026-07-12 05:45 UTCEPSS rescore
  9. 2026-07-11 08:26 UTCEPSS rescore
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  11. 2026-07-09 19:09 UTCEPSS rescore
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  20. 2026-07-01 15:05 UTCEPSS rescore
  21. 2026-06-30 23:21 UTCEPSS rescore
  22. 2026-06-30 23:21 UTCEPSS rescore
  23. 2026-06-28 14:06 UTCEPSS rescore
  24. 2026-06-28 14:06 UTCEPSS rescore
  25. 2026-06-28 04:55 UTCEPSS rescore
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  27. 2026-06-27 03:07 UTCEPSS rescore
  28. 2026-06-27 03:07 UTCEPSS rescore
  29. 2026-06-25 13:49 UTCEPSS rescore
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  41. 2026-06-18 17:51 UTCEPSS rescore
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  43. 2026-06-17 17:52 UTCEPSS rescore
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  45. 2026-06-16 17:52 UTCEPSS rescore
  46. 2026-06-16 17:51 UTCEPSS rescore
  47. 2026-06-15 17:47 UTCEPSS rescore
  48. 2026-06-13 22:59 UTCEPSS rescore
  49. 2026-06-13 22:59 UTCEPSS rescore
  50. 2026-06-12 23:11 UTCEPSS rescore
  51. 2026-06-12 23:11 UTCEPSS rescore
  52. 2026-06-10 22:17 UTCEPSS rescore
  53. 2026-06-08 14:16 UTCEPSS rescore
  54. 2026-06-07 15:24 UTCEPSS rescore
  55. 2026-06-07 15:24 UTCEPSS rescore
  56. 2026-06-06 13:46 UTCEPSS rescore
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  58. 2026-06-05 22:46 UTCEPSS rescore
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  60. 2026-06-05 06:09 UTCEPSS rescore
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  62. 2026-06-04 13:11 UTCEPSS rescore
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  64. 2026-06-04 13:11 UTCEPSS rescore
  65. 2026-06-02 20:12 UTCEPSS rescore
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  67. 2026-06-01 13:51 UTCEPSS rescore
  68. 2026-06-01 13:51 UTCEPSS rescore
  69. 2026-06-01 13:51 UTCEPSS rescore
  70. 2026-05-31 00:15 UTCEPSS rescore
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  72. 2026-05-29 13:43 UTCEPSS rescore
  73. 2026-05-29 13:43 UTCEPSS rescore
  74. 2026-05-28 13:44 UTCEPSS rescore
  75. 2026-05-28 13:44 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCseadragnol/CVE-2024-29943
    First seen Nov 25, 2025

    Reproducing CVE-2024-29943 for Windows, based on https://github.com/bjrjk/CVE-2024-29943

    Open source ↗
  • GitHub PoCbjrjk/CVE-2024-29943
    First seen Jun 27, 2024

    A Pwn2Own 2024 SpiderMonkey JIT Bug: From Integer Range Inconsistency to Bound Check Elimination then RCE

    Open source ↗

Frequently asked(5)

What is CVE-2024-29943?
CVE-2024-29943 is a critical vulnerability published on March 22, 2024. An attacker was able to perform an out-of-bounds read or write on a JavaScript object by fooling range-based bounds check elimination. This vulnerability affects Firefox < 124.0.1.
When was CVE-2024-29943 disclosed?
CVE-2024-29943 was first published in the National Vulnerability Database on March 22, 2024, with the most recent update on April 1, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-29943 actively exploited?
CVE-2024-29943 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23% probability of exploitation in the next 30 days, which ranks it in the top 2.5% of all scored CVEs.
What is the CVSS score of CVE-2024-29943?
CVE-2024-29943 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2024-29943?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-29943, 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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