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CVE-2025-4919: 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...
8.8
CVSS
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 ESR < 115.23.1.
Classification
CVE ID: CVE-2025-4919
CVSS Base Severity: HIGH
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Problem Types
Out-of-bounds access when optimizing linear sumsAffected Products
Vendor: Mozilla
Product: Firefox ESR
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 9.15% (scored less or equal to compared to others)
EPSS Date: 2025-06-15 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-4919https://bugzilla.mozilla.org/show_bug.cgi?id=1966614
https://www.mozilla.org/security/advisories/mfsa2025-38/