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CVE-2024-29943

CriticalPublished

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...

Published: Mar 22, 2024
Updated: Feb 13, 2025
Assigning CNA: mozilla
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

22.9%

Moderate · next 30 days

Percentile: 97.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2024-29943Exploit
A Pwn2Own 2024 SpiderMonkey JIT Bug: From Integer Range Inconsistency to Bound Check Elimination then RCE
CVE-2024-29943Exploit
Reproducing CVE-2024-29943 for Windows, based on https://github.com/bjrjk/CVE-2024-29943

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