Windows Server 2019 must be maintained at a supported servicing level.

Severity
Group ID
Group Title
Version
Rule ID
Date
STIG Version
highV-205849SRG-OS-000480-GPOS-00227WN19-00-000100SV-205849r991589_rule2025-02-253
Description
Systems at unsupported servicing levels will not receive security updates for new vulnerabilities, which leave them subject to exploitation. Systems must be maintained at a servicing level supported by the vendor with new security updates.
ℹ️ Check
Open "Command Prompt". Enter "winver.exe". If the "About Windows" dialog box does not display "Microsoft Windows Server Version 1809 (Build 17763.xxx)" or greater, this is a finding. Preview versions must not be used in a production environment.
✔️ Fix
Update the system to a Version 1809 (Build 17763.xxx) or greater.