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-1F6D97DA-8F72-11EB-B3F1-005056A311D1:
The Samba Team reports:
CVE-2020-27840: An anonymous attacker can crash the Samba AD DC
LDAP server by sending easily crafted DNs as
part of a bind request. More serious heap corruption
is likely also possible.
CVE-2021-20277: User-controlled LDAP filter strings against
the AD DC LDAP server may crash the LDAP server.
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