Windows OS: Must not have the Telnet Client Installed

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Unnecessary services increase the attack surface of a system. Some of these services may not support the required levels of authentication or encryption or may provide unauthorized access to the system.

Remediation

To fix this: 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.

STIG
Server
2022: https://stigviewer.com/stigs/microsoft_windows_server_2022/2025-01-14/finding/V-254273
2019: https://stigviewer.com/stigs/microsoft_windows_server_2019/2025-01-15/finding/V-205698

Desktop
W11: https://stigviewer.com/stigs/microsoft_windows_11/2024-09-12/finding/V-253278
W10: https://stigviewer.com/stigs/microsoft_windows_10/2024-11-25/finding/V-220721