Description
Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. 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 < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-47/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-45/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-43/
Broken Link x_refsource_misc
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1685354%2C1715755%2C1723176
Scores
CVSS v3
8.8
EPSS
0.0050
EPSS Percentile
66.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Details
Status
published
Products (3)
mozilla/firefox
< 93.0
mozilla/firefox_esr
< 91.2
mozilla/thunderbird
< 91.2
Published
Nov 03, 2021
Tracked Since
Feb 18, 2026