CVE-2021-29981

High

Description

An issue present in lowering/register allocation could have led to obscure but deterministic register confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability affects Firefox < 91 and Thunderbird < 91.

SeverityHigh

CVSS8.8

Exploit probability—

Product

Mozilla Firefox

PublishedAug 17, 2021

First seenAug 17, 2021

How to fix

Update

mozilla firefox91.0 or later
mozilla thunderbird91.0 or later

Vendor advisories

security.gentoo.org/glsa/202202-03

Affected products

Product	Affected versions	Fixed in
mozilla firefox	v < 91.0	91.0
mozilla thunderbird	v < 91.0	91.0

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