A missing input sanitization flaw was found in the implementation of LDP database used for the LDAP server. An attacker could use this flaw to cause a denial of service against a samba server, used as a Active Directory Domain Controller. All versions of Samba from 4.8.0 onwards are vulnerable
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1140
https://bugzilla.samba.org/show_bug.cgi?id=13374
https://security.gentoo.org/glsa/202003-52