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CVE-2025-4921
Firefox JavaScript Out-of-Bounds Access Vulnerability
Description

Rejected reason: Duplicate of CVE-2025-4919

INFO

Published Date :

May 17, 2025, 10:15 p.m.

Last Modified :

May 18, 2025, 8:15 p.m.

Remotely Exploit :

No

Source :

[email protected]
Affected Products

The following products are affected by CVE-2025-4921 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Mozilla firefox
2 Mozilla firefox_esr
: Total Affected Vendor : 1 | Products : 2
Solution
The vulnerability is a duplicate of CVE-2025-4919. No specific remediation is required for this entry.
  • Review CVE-2025-4919 for remediation steps.
  • Ensure the system is updated to address the original vulnerability.
Public PoC/Exploit Available at Github

CVE-2025-4921 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
doomygloom/CVE-2025-4921

CVE-2025-4921

Updated: 3 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : May 18, 2025, 2:05 a.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-4921 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-4921 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Rejected by [email protected]

    May. 18, 2025

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    May. 18, 2025

    Action Type Old Value New Value
    Changed Description An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability affects Firefox < 138.0.4 and Firefox ESR < 128.10.1. Rejected reason: Duplicate of CVE-2025-4919
    Removed Reference Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1966614
    Removed Reference Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-36/
    Removed Reference Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-37/
  • New CVE Received by [email protected]

    May. 17, 2025

    Action Type Old Value New Value
    Added Description An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability affects Firefox < 138.0.4 and Firefox ESR < 128.10.1.
    Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1966614
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-36/
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-37/
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.