Vulnerability Discussion
The "Telnet Client" is not installed by default. Some protocols and services do not support required security features, such as encrypting passwords or traffic.
Check
Verify Telnet Client has not been installed.
Navigate to the Windows\System32 directory.
If the "telnet" application exists, this is a finding.
Fix
Uninstall "Telnet Client" from the system.
Run "Programs and Features".
Select "Turn Windows Features on or off".
De-select "Telnet Client".