VULNERABILITY INTELLIGENCE

CVE-2021-23965

CVSS score8.8 HIGH

EPSS probability0.97%

CISA KEVNot currently listed

Published2021-02-26

Last modified2026-06-17

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

Description

Mozilla developers reported memory safety bugs present in Firefox 84. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 85.

Weakness classification

CWE-787: Out-of-bounds Write

Primary references

security@mozilla.org — Exploit, Issue Tracking, Patch, Vendor Advisory
security@mozilla.org — Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory