Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-3E01AAD2-680E-11EB-83E2-E09467587C17:
Chrome Releases reports:
[1170176] High CVE-2021-21148: Heap buffer overflow in V8.
Reported by Mattias Buelens on 2021-01-24. Google is aware of
reports that an exploit for CVE-2021-21148 exists in the wild.
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