VULNERABILITY INTELLIGENCE

CVE-2021-29947

CVSS score8.8 HIGH

EPSS probability0.87%

CISA KEVNot currently listed

Published2021-06-24

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 and community members reported memory safety bugs present in Firefox 87. 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 < 88.

Weakness classification

nvd@nist.gov: CWE-787

Primary references

security@mozilla.org — Broken Link, Vendor Advisory
security@mozilla.org — Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Broken Link, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory