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CVE-2024-29943

INDEX BUILT · 2026-09-20

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An attacker was able to perform an out-of-bounds read or write on a JavaScript object by fooling range-based bounds check elimination

CVE-2024-299434 of 4 sources documented this
20

rank 20 = 18 + 0 + 0 + 2 + 0

rank@v1 · backlog

Someone is already using it

CISA KEV catalog · public proof-of-concept · FIRST EPSS

EPSS 0.22935  ·  without this subject the record ranks 2

What it costs you if it fires

NVD CVSS base score, then the CNA's own

no CVSS held by anyone  ·  without this subject the record ranks 20

It is getting worse, not staying still

FIRST EPSS series, rescorings and bad loads removed

no persisting rise in 365 days  ·  without this subject the record ranks 20

How much of the world it touches

NVD CPE configurations

1 product in the CPE ranges  ·  without this subject the record ranks 18

Someone else already set the date

CISA KEV remediation due date

no CISA due date  ·  without this subject the record ranks 20

Hindsight · the state

0.22935EPSSNOT IN KEVas of 2026-09-20
Severitynot scored
Harmnot stated
Exploitationpublic proof-of-conceptreceipt
Defensefix version namedreceipt
Movementthreshold crossedreceipt
RISING10Risen from 0.00043 to 0.22935 across 39 observations. arc-rules@v1

Foresight · where to check next

NetScaler ADCpolkitGoogle ChromeESXiMicrosoft Windows29943

This record is one instance of CWE-125, out-of-bounds read. The index holds 9767 prior instances of this class, 19 KEV-listed. The nearest of its KEV-listed records are drawn beside this. taxonomy@v1

Full pattern panel

Prior records in this weakness class. Each is its own record, dated and receipted.
Color is a claim, not decoration:the hostile worldthe defenseno signal

Running Mozilla Firefox? Check your version

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Harm, if it fires from the vector and the weakness

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ReachNo CVSS vector in held sources, so no reach or impact can be stated.
Weakness classCWE-125 Out-of-bounds Read; CWE-787 Out-of-bounds Writereceipt
Published consequencesCWE-125: Confidentiality: Read Memory; Confidentiality: Bypass Protection Mechanism; Availability: DoS: Crash, Exit, or Restart; Other: Varies by Context[email protected]

CISA KEV & Federal Remediation Deadline from the record and CISA

The fix, and how long it's been waiting.

Fixed in124.0.1receipt
Patch available sinceNo dated patch-availability record in held sources. The index holds reference URLs without dates and only the current revision of the CVE record, so the day a fix first existed cannot be derived. Only the versions it landed in.

Exploit Status & Known PoCs a ladder, not a score

Current rung: Proof-of-concept published · 3 public repositories, 2024-06-27.

  • RUNG 1Nothing observed in held sources
  • RUNG 2Proof-of-concept published · 3 public repositories2024-06-27receipt
  • RUNG 3Exploited in the wild · CISA KEV listed
  • RUNG 4Ransomware campaign use known

Authority who says so

Exploit probability0.22935 · top 2% of all CVEsreceipt
Blast breadth1 product across 1 vendorderived
Assigned bymozillareceipt
Recorded changes42 · last 19 Sep 2026derived

Affected & Fixed Versions as published

Affected productMozilla Firefoxreceipt
Published rangesmozilla firefox < 124.0.1receipt
Fixed in124.0.1receipt

A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.

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What it is stated by the CNA

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. receipt

NVD's analysis a second authority

weakness
CWE-125; CWE-787
affected versions
mozilla firefox < 124.0.1
also scored by
9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

check it yourself bugzilla.mozilla.org mozilla.org openwall.com receipt

Dated events

2025-03-17EPSS moved 0.00 to 0.252026-06-15EPSS moved 0.54 to 0.23

Movement the material steps

23 Mar 20240.00043
17 Mar 20250.24595 · crossed 0.10 · scoring model v2025.03.14
20 Mar 20250.05252 · crossed 0.10
23 Mar 20250.24595 · crossed 0.10
30 Apr 20250.42067
9 May 20250.59083 · crossed 0.50
1 Jun 20250.46767 · crossed 0.50
4 Jun 20250.6321 · crossed 0.50
1 Jul 20250.46767 · crossed 0.50
4 Jul 20250.6321 · crossed 0.50
1 Aug 20250.46767 · crossed 0.50
4 Aug 20250.6321 · crossed 0.50
1 Sep 20250.4021 · crossed 0.50
5 Sep 20250.57368 · crossed 0.50
1 Oct 20250.4021 · crossed 0.50
4 Oct 20250.57368 · crossed 0.50
1 Nov 20250.4021 · crossed 0.50
4 Nov 20250.57368 · crossed 0.50
1 Dec 20250.4021 · crossed 0.50
4 Dec 20250.57368 · crossed 0.50
1 Jan 20260.4021 · crossed 0.50
4 Jan 20260.51074 · crossed 0.50
1 Feb 20260.4021 · crossed 0.50
4 Feb 20260.51074 · crossed 0.50
1 Mar 20260.4021 · crossed 0.50
4 Mar 20260.51074 · crossed 0.50
15 Jun 20260.22935 · crossed 0.50 · scoring model v2026.06.15

This score more than doubled inside 72 hours. Both observations are in the full history below.

Show all 39 observations
23 Mar 20240.00043
2 May 20240.00045
28 Jun 20240.00046
17 Mar 20250.24595
20 Mar 20250.05252
23 Mar 20250.24595
27 Mar 20250.34451
28 Mar 20250.24595
2 Apr 20250.23938
15 Apr 20250.17035
30 Apr 20250.42067
9 May 20250.59083
15 May 20250.6321
1 Jun 20250.46767
4 Jun 20250.6321
1 Jul 20250.46767
4 Jul 20250.6321
1 Aug 20250.46767
4 Aug 20250.6321
11 Aug 20250.57368
1 Sep 20250.4021
5 Sep 20250.57368
1 Oct 20250.4021
4 Oct 20250.57368
1 Nov 20250.4021
4 Nov 20250.57368
18 Nov 20250.53172
21 Nov 20250.57368
1 Dec 20250.4021
4 Dec 20250.57368
18 Dec 20250.51074
1 Jan 20260.4021
4 Jan 20260.51074
1 Feb 20260.4021
4 Feb 20260.51074
1 Mar 20260.4021
4 Mar 20260.51074
10 Apr 20260.53858
15 Jun 20260.22935

39 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt

The full biography

EPSS 0.22935Published2024-03-22Public PoC2024-06-27Index as of2026-06-15

Exploit probability more than doubled between 2025-03-20 and 2025-03-23 (0.05252 → 0.24595) and the record had been public for 2 years, 2 months when this index was last written.

Published 2024-03-22 receipt · Public PoC 2024-06-27 receipt · Index as of 2026-06-15 derived

The pattern, elsewhere

This record is one instance of CWE-125, out-of-bounds read. The index holds 9767 prior instances of this class, 19 KEV-listed. The nearest of its KEV-listed records are drawn beside this. [email protected]

CVE-2025-5777 · NetScaler ADConly 2 attributes comparableKEV listed · 2025receipt
CVE-2021-4034 · polkitonly 2 attributes comparableKEV listed · 2022receipt
CVE-2026-11645 · Google Chromeonly 2 attributes comparableKEV listed · 2026receipt
CVE-2026-3055 · NetScaler ADConly 2 attributes comparableKEV listed · 2026receipt
CVE-2025-22226 · ESXionly 2 attributes comparableKEV listed · 2025receipt
CVE-2025-24991 · Microsoft Windows 10 Version 1507only 2 attributes comparableKEV listed · 2025receipt

"Matches n of m" counts the attributes the two records can both be compared on: the CVSS metrics they share a version of, any weakness class beyond this one, and the vendor. fit-rules@v1

9767 records in this class held. The six above are drawn from the ones CISA has listed as exploited, ranked by how much of the record matches this one. That is why every one of them is KEV-listed: the pool is, so the colour on those spokes says nothing the pool has not already said.

No curated product neighbourhood is held for this product, so the records above are the nearest this index can name. The neighbourhood table covers a small set of products and is extended by hand.

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