Continuous Monitoring Strategy

NIST SP 800-53 CA-7 Compliance Template

Template v1.0 | May 2026 | Axiom Sovereign Engine

Instructions: This template satisfies the CA-7 requirement for a system-level Continuous Monitoring Strategy. Fields marked with yellow highlight must be completed by the organization. Axiom-automated sections are pre-populated with current platform capabilities.

1. Purpose and Scope

This Continuous Monitoring Strategy defines the ongoing assessment, monitoring, and reporting requirements for [System Name] operated by [Organization Name]. It establishes monitoring frequencies, metrics, response actions, and reporting cadences to maintain the security authorization granted by the Authorizing Official.

This strategy is developed in accordance with NIST SP 800-137, NIST SP 800-53 CA-7, and the organization's Risk Management Framework implementation.

1.1 System Identification

System Name	[System Name]
System Owner	[Name, Title]
Authorizing Official	[Name, Title]
ISSO	[Name, Title]
Authorization Date	[Date]
Authorization Type	[ATO / IATT / IATO]
FIPS 199 Categorization	[LOW / MODERATE / HIGH]

2. Monitoring Approach

The system employs a hybrid monitoring approach combining automated continuous assessment with periodic manual review:

Automated Technical Monitoring: Axiom Sovereign Engine performs agentless evidence collection across 123 technical controls every 4 hours. Each scan produces cryptographic SWT3 witness anchors that are immutable and independently verifiable.
Manual Assessment: Non-technical controls (physical security, personnel, training) are assessed on defined schedules by designated personnel and documented via attestation.
Vulnerability Management: Trivy scans execute daily at 04:00 UTC. Findings auto-sync to POA&M with severity-based milestones (CAT I: 30 days, CAT II: 60 days, CAT III: 90 days).

3. Monitoring Frequencies by Control Family

NIST 800-53 CA-7(b) requires defined monitoring frequencies per control. Different control types require different monitoring cadences. The following table establishes the frequency and justification for each family.

Control Family	Frequency	Method	Justification
AC (Access Control)	Every 4 hours	AUTOMATED	Access violations are high-impact. Continuous scanning detects unauthorized accounts, stale credentials, and privilege changes.
AU (Audit)	Every 4 hours	AUTOMATED	Audit log integrity is foundational. Automated checks verify log generation, storage capacity, and retention compliance.
CA (Assessment)	Every 4 hours	AUTOMATED	Continuous assessment is the core CA-7 requirement. Axiom implements this directly via automated scan cadence.
CM (Configuration)	Every 4 hours	AUTOMATED	Configuration drift detection requires high-frequency monitoring. Changes to baselines are flagged immediately.
CP (Contingency)	Quarterly	MANUAL	Backup and recovery testing requires physical execution. Attestation-based, reviewed quarterly by ISSO.
IA (Identification)	Every 4 hours	AUTOMATED	Authentication mechanisms (MFA, password policy) verified continuously via automated probes.
IR (Incident Response)	Annually + event-driven	MANUAL	IR plan review is annual. Tabletop exercises require human coordination. Event-driven assessment after any incident.
MA (Maintenance)	Every 4 hours	AUTOMATED	System update status and patch levels verified continuously.
MP (Media Protection)	Quarterly	MANUAL	Physical media handling requires manual verification. Attestation-based.
PE (Physical/Environmental)	Quarterly	MANUAL	Physical access controls, facility security, and environmental protections require on-site inspection.
PL (Planning)	Annually	MANUAL	Security plan review is an annual activity tied to re-authorization cycle.
PS (Personnel Security)	Quarterly	MANUAL	Background check status and access termination require HR system verification. Attestation-based.
RA (Risk Assessment)	Every 4 hours (vuln scan) + Annually (full RA)	AUTOMATED + MANUAL	Vulnerability scanning automated daily. Full risk assessment is an annual activity with human analysis.
SA (System Acquisition)	Every 4 hours + Quarterly	AUTOMATED + MANUAL	Supply chain scanning automated (Trivy 5-layer). Vendor contract review is quarterly.
SC (System Communications)	Every 4 hours	AUTOMATED	TLS configuration, boundary protection, and network segmentation verified continuously.
SI (System Integrity)	Every 4 hours	AUTOMATED	Flaw remediation, malicious code protection, and integrity monitoring verified continuously.
AT (Awareness Training)	Annually	MANUAL	Training completion requires LMS verification. Annual cycle aligned with onboarding and refresher schedule.
AI (AI Governance)	Per-inference (real-time)	AUTOMATED	SWT3 witness anchors are minted per inference. 43 AI procedures cover model integrity, fairness, explainability, and security.

4. Metrics and Thresholds

4.1 Automated Metrics (Axiom-Generated)

Metric	Source	Threshold	Response Action
Sovereign Score	Posture API	Below 90%: WARN. Below 80%: FAIL.	ISSO notified. Gap analysis initiated. AO briefed within 48 hours if FAIL.
Overdue POA&M Items	POA&M API	Any CAT I overdue: Immediate escalation.	ISSO escalates to AO. Remediation sprint initiated.
CRITICAL/HIGH CVEs	Trivy scan	CRITICAL: 7-day remediation. HIGH: 30-day.	Auto-POA&M creation. ISSO review within 24 hours for CRITICAL.
Scan Freshness	Health API	Last scan older than 24 hours: WARN.	Investigate scan pipeline. Manual scan if automated cadence failed.
AI Model Drift	AI Witness API	AI-MDL.3 factor_c negative (degradation detected).	Model review. Potential rollback. ISSO documents in POA&M.

4.2 Manual Metrics

Metric	Frequency	Responsible	Threshold
Security training completion rate	Annually	[Training Manager]	100% within 30 days of onboarding or annual refresher date.
Background check currency	Quarterly	[HR / Security Manager]	All personnel with system access have current investigation.
Physical access review	Quarterly	[Facility Security Officer]	Access lists reviewed and attested. Terminated personnel removed within 24 hours.
Contingency plan test	Annually	[ISSO / ISSM]	Test executed. After-action report completed. Lessons learned documented.

5. Response Actions

Per CA-7(f), the following response actions address results of control assessment and monitoring:

Automated Response: FAIL verdicts auto-open POA&M items with severity-based milestones. PASS verdicts auto-close with cryptographic closure anchors. No manual intervention required.
ISSO Triage: ISSO reviews new FAIL items within 24 hours (CAT I) or 72 hours (CAT II/III). Assigns responsible party, estimated cost, and remediation plan.
AO Escalation: Any CAT I finding overdue beyond milestone, or Sovereign Score below 80%, triggers AO briefing within 48 hours.
Risk Acceptance: Items that cannot be remediated require formal AO risk acceptance with written justification (available for IATT/IATO authorization types only).
Re-Authorization Trigger: Significant changes to the system (new AI models, infrastructure migration, new interconnections) trigger re-assessment per CA-6.

6. Reporting

Report	Audience	Frequency	Source
Executive Summary	AO, System Owner	Monthly	GET /api/v1/executive-summary
Gap-to-Green Roadmap	ISSO, ISSM	After each assessment	GET /api/v1/gap-to-green
POA&M Status	AO, ISSO, C3PAO	Monthly	GET /api/v1/poam/export
Vulnerability Report	ISSO, System Admin	After each scan	GET /api/v1/cve/export
OSCAL Assessment Results	C3PAO, eMASS	Quarterly	GET /api/v1/ar/export
AI Witness Posture	ISSO, AI Governance Board	Monthly	GET /api/v1/ai-witness/export

7. Roles and Responsibilities

Role	ConMon Responsibility	Assigned To
Authorizing Official	Reviews monthly posture reports. Accepts residual risk. Triggers re-authorization when warranted.	[Name]
ISSO	Triages new findings within SLA. Assigns responsible parties. Manages POA&M lifecycle. Conducts manual assessments.	[Name]
ISSM	Reviews ConMon strategy annually. Coordinates with C3PAO. Oversees attestation controls.	[Name]
System Administrator	Remediates technical findings per POA&M milestones. Verifies fixes via re-scan.	[Name]
Security Engineer	Maintains scan infrastructure. Investigates scan failures. Updates remediation library.	[Name]

8. Strategy Review and Update

This Continuous Monitoring Strategy shall be reviewed and updated:

Annually, as part of the re-authorization cycle
After any significant system change (new interconnections, infrastructure migration, new AI models)
After any security incident requiring IR plan activation
When directed by the AO based on risk posture changes

Version	Date	Author	Changes
1.0	[Date]	[ISSO Name]	Initial ConMon strategy

9. Approval

Role	Name	Signature	Date
Authorizing Official	[Name]	[Signature]	[Date]
ISSO	[Name]	[Signature]	[Date]
System Owner	[Name]	[Signature]	[Date]