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CVE-2025-4918: An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox ESR < 115.23.1.

7.5 CVSS

Description

An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability affects Firefox ESR < 115.23.1.

Classification

CVE ID: CVE-2025-4918

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types

Out-of-bounds access when resolving Promise objects

Affected Products

Vendor: Mozilla

Product: Firefox ESR

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 10.49% (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-2025-4918
https://bugzilla.mozilla.org/show_bug.cgi?id=1966612
https://www.mozilla.org/security/advisories/mfsa2025-38/

Timeline