Related Vulnerabilities: CVE-2020-15681  

A memory corruption issue has been found in Firefox before 82.0 where, when multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten the entry of another thread in a shared stub table, resulting in a potentially exploitable crash.

Severity Medium

Remote Yes

Type Arbitrary code execution

Description

A memory corruption issue has been found in Firefox before 82.0 where, when multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten the entry of another thread in a shared stub table, resulting in a potentially exploitable crash.

AVG-1256 firefox 81.0.2-1 82.0-1 Critical Fixed

02 Nov 2020 ASA-202011-1 AVG-1256 firefox Critical multiple issues

https://www.mozilla.org/en-US/security/advisories/mfsa2020-45/#CVE-2020-15681
https://bugzilla.mozilla.org/show_bug.cgi?id=1666568