CVE-2021-29976
HIGHFirefox < 90.0 and Firefox ESR < 78.12 - Out-of-bounds Write
Title source: llmDescription
Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. 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 Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
References (6)
Core 6
Core References
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-28/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-30/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-29/
Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1700895%2C1703334%2C1706910%2C1711576%2C1714391
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202202-03
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202208-14
Scores
CVSS v3
8.8
EPSS
0.0059
EPSS Percentile
69.4%
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
< 90.0
mozilla/firefox_esr
< 78.12
mozilla/thunderbird
< 78.12
Published
Aug 05, 2021
Tracked Since
Feb 18, 2026