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CVE-2021-23954 Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion,…

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 85 earliest → < 85 85
Thunderbird 78.7 earliest → < 78.7 78.7
Firefox ESR 78.7 earliest → < 78.7 78.7

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