Related Vulnerabilities: CVE-2021-29981  

A security issue has been found in Firefox before version 91. 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.

Severity High

Remote Yes

Type Arbitrary code execution

Description

A security issue has been found in Firefox before version 91. 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.

AVG-2269 firefox 90.0.2-1 High Vulnerable

https://www.mozilla.org/security/advisories/mfsa2021-33/
https://bugzilla.mozilla.org/show_bug.cgi?id=1707774