CVE-2021-43537
An incorrect type conversion of sizes from 64bit to 32bit integers allowed an attacker to corrupt memory leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95. Date published : 2021-12-08 https://bugzilla.mozilla.org/show_bug.cgi?id=1738237