CVE-2024-29943

CRITICAL

Firefox < 124.0.1 - Memory Corruption

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2024-29943. PoCs published by bjrjk, seadragnol.

AI-analyzed exploit summary This repository contains a functional exploit for CVE-2024-29943, leveraging a type confusion vulnerability in JavaScript engines to achieve arbitrary memory read/write and execute shellcode. The exploit demonstrates advanced techniques like heap spraying, address manipulation, and JIT code execution.

Description

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.

Exploits (2)

nomisec WORKING POC 95 stars
by bjrjk · poc
https://github.com/bjrjk/CVE-2024-29943

This repository contains a functional exploit for CVE-2024-29943, leveraging a type confusion vulnerability in JavaScript engines to achieve arbitrary memory read/write and execute shellcode. The exploit demonstrates advanced techniques like heap spraying, address manipulation, and JIT code execution.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: JavaScript engines (likely SpiderMonkey or V8)
No auth needed
Prerequisites: Target system running vulnerable JavaScript engine · Ability to execute arbitrary JavaScript code
devstral-2 · analyzed Feb 18, 2026 Full analysis →
nomisec WORKING POC 2 stars
by seadragnol · poc
https://github.com/seadragnol/CVE-2024-29943

This repository contains a functional exploit for CVE-2024-29943, leveraging a type confusion vulnerability in SpiderMonkey's JIT compiler to achieve arbitrary read/write primitives and execute shellcode. The PoC demonstrates heap manipulation, memory corruption, and RCE via crafted JavaScript arrays and BigUint64 operations.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Mozilla SpiderMonkey (JavaScript engine)
No auth needed
Prerequisites: SpiderMonkey with specific mitigations disabled (--ion-offthread-compile=off --spectre-mitigations=off)
devstral-2 · analyzed Feb 19, 2026 Full analysis →

Scores

CVSS v3 9.8
EPSS 0.2293
EPSS Percentile 97.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

CWE
CWE-125 CWE-787
Status published
Products (1)
mozilla/firefox < 124.0.1
Published Mar 22, 2024
Tracked Since Feb 18, 2026