Description
Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
References (7)
Core 7
Core References
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-33/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-35/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-34/
Vendor Advisory x_refsource_misc
https://www.mozilla.org/security/advisories/mfsa2021-36/
Exploit, Issue Tracking, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1720031
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
0.0045
EPSS Percentile
63.7%
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
< 91.0
mozilla/firefox_esr
< 78.13.0
mozilla/thunderbird
< 78.13.0
Published
Aug 17, 2021
Tracked Since
Feb 18, 2026