Windows Server 2025 must prevent local accounts with blank passwords from being used from the network.

An account without a password can allow unauthorized access to a system as only the username would be required. Password policies must prevent accounts with blank passwords from existing on a system. However, if a local account with a blank password does exist, enabling this setting will prevent network access, limiting the account to local console logon only.

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SYSTEM\CurrentControlSet\Control\Lsa\

Value Name: LimitBlankPasswordUse

Value Type: REG_DWORD Value: 0x00000001 (1)

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Accounts: Limit local account use of blank passwords to console logon only to "Enabled".