VULNERABILITY INTELLIGENCE

CVE-2021-29982

CVSS score6.5 MEDIUM

EPSS probability1.12%

CISA KEVNot currently listed

Published2021-08-17

Last modified2026-06-17

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.