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Windows 10 systems must use a BitLocker PIN with a minimum length of six digits for pre-boot authentication.


Finding ID Version Rule ID IA Controls Severity
V-220704 WN10-00-000032 SV-220704r859297_rule Medium
If data at rest is unencrypted, it is vulnerable to disclosure. Even if the operating system enforces permissions on data access, an adversary can remove non-volatile memory and read it directly, thereby circumventing operating system controls. Encrypting the data ensures that confidentiality is protected even when the operating system is not running. Pre-boot authentication prevents unauthorized users from accessing encrypted drives. Increasing the PIN length requires a greater number of guesses for an attacker.
Microsoft Windows 10 Security Technical Implementation Guide 2023-09-29


Check Text ( C-22419r819654_chk )
If the following registry value does not exist or is not configured as specified, this is a finding.

For virtual desktop implementations (VDIs) in which the virtual desktop instance is deleted or refreshed upon logoff, this is NA.

For Azure Virtual Desktop (AVD) implementations with no data at rest, this is NA.

Registry Path: \SOFTWARE\Policies\Microsoft\FVE\

Value Name: MinimumPIN
Value: 0x00000006 (6) or greater
Fix Text (F-22408r554598_fix)
Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> BitLocker Drive Encryption >> Operating System Drives "Configure minimum PIN length for startup" to "Enabled" with "Minimum characters:" set to "6" or greater.