VULNERABILITY INTELLIGENCE

CVE-2021-23954

CVSS score8.8 HIGH

EPSS probability1.19%

CISA KEVNot currently listed

Published2021-02-26

Last modified2026-06-17

Description

Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.