NIST 800-171 Control 3.12.3: Security Control Monitoring
Security controls only protect your organization if they remain effective over time. NIST 800-171 control 3.12.3 requires ongoing monitoring of your security controls to detect degradation, changes in your environment, and emerging threats. This control ensures your compliance posture stays current and your defenses remain operational.
What this means
Control 3.12.3 mandates that organizations establish and maintain continuous monitoring processes for all deployed security controls. Rather than implementing controls once and assuming they remain effective, you must actively track control performance, validate that controls function as designed, and identify when controls need updates or replacement. This includes monitoring for configuration drift, control bypasses, and environmental changes that may impact control effectiveness.
How to comply
- 1.Establish a documented monitoring schedule for each security control identifying frequency and responsibility
- 2.Define metrics and thresholds that indicate whether each control is operating effectively
- 3.Implement automated tools or manual processes to collect control performance data on a regular basis
- 4.Review monitoring results against defined metrics to assess ongoing control effectiveness
- 5.Document all monitoring activities, findings, and any remediation actions taken
- 6.Update monitoring processes when controls are modified or when your environment changes
- 7.Conduct periodic reviews of monitoring effectiveness itself to ensure your process is adequate
Evidence auditors look for
- Control monitoring policy documenting scope, frequency, and responsibility assignments
- Access control logs showing regular validation that access permissions match authorization records
- Firewall rule reviews demonstrating periodic verification that rules align with security requirements
- System configuration baselines compared against current configurations to detect drift
- Antivirus/endpoint protection logs confirming continuous threat detection and signature updates
- Monitoring dashboard or reports tracking control status across your environment
- Remediation records documenting control failures identified and corrective actions taken
- Training records showing staff responsible for control monitoring understand their duties
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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