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Event ID: 523 Source: Security

The security log is now <value> percent full.
To see event 523 in the Security event log the WarningLevel registry value must be added and set to the percentage threshold for the security event log at which the system will generate a warning:
Value: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog\Security\WarningLevel

This option is supported starting with Windows 2000 SP3, Windows XP, and Windows Server 2003.

The Windows XP security guide states that if log settings are configured for Overwrite events as needed or Overwrite events older than x days, event 523 will not be generated.

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