Description
Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object, resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and Thunderbird < 91.
References (4)
Core 4
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/mfsa2021-36/
Exploit, Issue Tracking, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1715318
Third Party Advisory vendor-advisory
x_refsource_gentoo
https://security.gentoo.org/glsa/202202-03
Scores
CVSS v3
6.5
EPSS
0.0112
EPSS Percentile
61.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Details
CWE
CWE-772
Status
published
Products (2)
mozilla/firefox
< 91.0
mozilla/thunderbird
< 91.0
Published
Aug 17, 2021
Tracked Since
Feb 18, 2026