Detections
Analytics

CVE-2025-4919

high

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, Firefox ESR < 128.10.1, and Firefox ESR < 115.23.1.

References

https://www.bleepingcomputer.com/news/security/mozilla-fixes-firefox-zero-days-exploited-at-hacking-contest/

https://thehackernews.com/2025/05/firefox-patches-2-zero-days-exploited.html

https://www.mozilla.org/security/advisories/mfsa2025-38/

https://www.mozilla.org/security/advisories/mfsa2025-37/

https://www.mozilla.org/security/advisories/mfsa2025-36/

https://bugzilla.mozilla.org/show_bug.cgi?id=1966614

Details

Source: Mitre, NVD

Published: 2025-05-17

Updated: 2025-05-19

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00018