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-B371DB92-FE34-11EA-B90E-6805CA2FA271:
PowerDNS Team reports
CVE-2020-17482: An issue has been found in PowerDNS Authoritative
Server before 4.3.1 where an authorized user with the
ability to insert crafted records into a zone might
be able to leak the content of uninitialized memory.
Such a user could be a customer inserting data via a
control panel, or somebody with access to the REST
API. Crafted records cannot be inserted via AXFR.
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