Samba Security Announcement Archive
https://www.samba.org/samba/security/CVE-2020-1472.html

>== Subject: Unauthenticated domain takeover via netlogon ("ZeroLogon")
>== CVE ID#: CVE-2020-1472
>== Versions: Samba 4.0 and later
>== Summary: An unauthenticated attacker on the network can gain administrator access by exploiting a netlogon protocol flaw.
>Description
>The following applies to Samba used as domain controller only (most seriously the Active Directory DC, but also the classic/NT4-style DC).
>...