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://system32.eventsentry.com/stig/viewer/V-254273
2019: https://system32.eventsentry.com/stig/viewer/V-205698

Desktop
W11: https://system32.eventsentry.com/stig/viewer/V-253278
W10: https://system32.eventsentry.com/stig/viewer/V-220721

CMMC v2: CM.L2-3.4.7
NIST 800-171 Rev2: 3.4.7
NIST 800-171A: 3.4.7[a], 3.4.7[b], 3.4.7[c], 3.4.7[d], 3.4.7[e], 3.4.7[f], 3.4.7[g], 3.4.7[h], 3.4.7[i], 3.4.7[j], 3.4.7[k], .4.7[l], 3.4.7[m], 3.4.7[n], 3.4.7[o]
NIST 800-171 Rev3: 03.04.06.c, 03.04.08.c
NIST 800-171A Rev3: A.03.04.06.ODP[06]