Microsoft Windows Server 2016
The Telnet Client must not be installed
Description
Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.
Check
Open "PowerShell".Enter "Get-WindowsFeature | Where Name -eq Telnet-Client".If "Installed State" is "Installed", this is a finding.An Installed State of "Available" or "Removed" is not a finding.
Fix
Uninstall the "Telnet Client" feature.Start "Server Manager".Select the server with the feature.Scroll down to "ROLES AND FEATURES" in the right pane.Select "Remove Roles and Features" from the drop-down "TASKS" list.Select the appropriate server on the "Server Selection" page and click "Next".Deselect "Telnet Client" on the "Features" page.Click "Next" and "Remove" as prompted.