Access by anonymous users must be restricted. If this setting is enabled, then anonymous users have the same rights and permissions as the built-in Everyone group. Anonymous users must not have these permissions or rights.
Check
If the following registry value does not exist or is not configured as specified, this is a finding:
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Let Everyone permissions apply to anonymous users" to "Disabled".