VULNERABILITY INTELLIGENCE

CVE-2021-29977

CVSS score8.8 HIGH

EPSS probability1.01%

CISA KEVNot currently listed

Published2021-08-05

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 89. 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 < 90.

Weakness classification

nvd@nist.gov: CWE-787

Primary references

security@mozilla.org — Issue Tracking, Vendor Advisory
security@mozilla.org — Third Party Advisory
security@mozilla.org — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory