It was found that Samba before versions 4.5.3, 4.4.8, 4.3.13 always requested forwardable tickets when using Kerberos authentication. A service to which Samba authenticated using Kerberos could subsequently use the ticket to impersonate Samba to other services or domain users.
Exploitability
AV:AAC:LPR:NUI:NScope
S:UImpact
C:HI:NA:N6.5/CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NAuthentication