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AC-09(01) Unsuccessful Logons

NIST SP 800-53 (controls) 5.2.0 against 5.2.0
All changes in this version
unchanged AC part of AC-9

Title

Unsuccessful Logons

Control

Notify the user, upon successful logon, of the number of unsuccessful logon attempts since the last successful logon.

Discussion

Information about the number of unsuccessful logon attempts since the last successful logon allows the user to recognize if the number of unsuccessful logon attempts is consistent with the user’s actual logon attempts.

Assessment objective

AC-09(01) the user is notified, upon successful logon, of the number of unsuccessful logon attempts since the last successful logon.

STIG rules that implement this control 0

No followed STIG rule cites a CCI indexed to this control (CCI list 2026-07-14).