Executive Summary
This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.
Microsoft is aware of reports that exploits for CVE-2021-21220 exist in the wild.
Update & Detail Chromium: CVE-2021-21220 Insufficient validation of untrusted input in V8 for x86_64