Description
Mozilla developers reported memory safety bugs present in Firefox 83 and Firefox ESR 78.5. 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 < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2020-54/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2020-56/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2020-55/
Permissions Required x_refsource_misc
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1664831%2C1673589
Scores
CVSS v3
8.8
EPSS
0.0053
EPSS Percentile
67.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Details
CWE
CWE-787
Status
published
Products (3)
mozilla/firefox
< 84.0
mozilla/firefox_esr
< 78.6.0
mozilla/thunderbird
< 78.6.0
Published
Jan 07, 2021
Tracked Since
Feb 18, 2026