Windows Server 2025 must not allow anonymous enumeration of Security Account Manager (SAM) accounts.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| high | V-278216 | SRG-OS-000480-GPOS-00227 | WN25-SO-000220 | SV-278216r1181354_rule | 2026-02-20 | 1 |
Description
Anonymous enumeration of SAM accounts allows anonymous logon users (null session connections) to list all accounts names, thus providing a list of potential points to attack the system.
ℹ️ Check
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: RestrictAnonymousSAM
Value Type: REG_DWORD
Value: 0x00000001 (1)
✔️ Fix
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network access: Do not allow anonymous enumeration of SAM accounts to "Enabled".