V-243480
Active Directory Domain Security Technical Implementation Guide
Title
The domain functional level must be at a Windows Server version still supported by Microsoft.
Description
<VulnDiscussion>Domains operating at functional levels below Windows Server versions no longer supported by Microsoft reduce the level of security in the domain and forest as advanced features of the directory are not available. This also prevents the addition of domain controllers to the domain using Windows Server versions prior to the current domain functional level.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigatio...
Fix Text (Documentation Requirement)
Raise the domain functional level to Windows Server 2016. Using the highest domain functional level supported by the domain controllers is recommended. Raising the domain functional level needs to be carefully planned and implemented. This prevents the addition of domain controllers to the domain using Windows versions prior to the current domain functional level. Refer to Microsoft documentation for the process and requirements of raising the domain functional level.