Public proof of conceptFix available

CVE-2024-29943

Q: Is CVE-2024-29943 actively exploited?

A proof-of-concept exploit exists for CVE-2024-29943, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2024-29943?

CVE-2024-29943 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2024-03-22
Fixed in124.0.1
WeaknessCWE-125 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2024-03-2213:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2024-29943?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2024-29943?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · CISA-ADP

Mozilla firefox

Branch	Affected	Fixed in	Source
124.0	< 124.0.1	124.0.1	NVD · CISA-ADP

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Mozilla firefox to 124.0.1

Advisories and patches

www.mozilla.orgVendor Advisory

Detection

read 2026-10-23 19:24 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 3 repositories, unverifiedbjrjk/CVE-2024-29943seadragnol/CVE-2024-29943SneakyNachos/CVE-2024-29943-but-with-wasm

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionpoc2024-07-10
OpenCVESSVC decisionpoc—
CISA-ADPCVSS 3.19.82024-08-12
CISA-ADPweakness (CWE)CWE-125, CWE-7872024-08-12
FIRST EPSSEPSS score22.9 %read 2026-10-23
PoC-in-GitHubproof of concept3read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2024-03-22
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2024-29943?

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.

Is CVE-2024-29943 actively exploited?

A proof-of-concept exploit exists for CVE-2024-29943, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2024-29943?

CVE-2024-29943 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database