What is the Cybersecurity Maturity Model?
A Cybersecurity Maturity Model is a framework that helps organisations assess, plan and improve the maturity of their security measures. It describes levels of structure, repeatability and effectiveness in the approach to Cybersecurity.
In OT environments, a maturity model supports the gradual introduction of security, calibrated to process-critical requirements and risk profile.
🧠 How does a Cybersecurity Maturity Model work?
Most models consist of five maturity levels:
| Level | Name | Description |
|---|---|---|
| 1 | Ad-hoc | No formal approach, reactive, undocumented |
| 2 | Repeatable | Basic measures present, partly repeatable but not consistent |
| 3 | Defined | Processes are defined, documented and applied across the organisation |
| 4 | Managed | Continuous monitoring, measurable performance, risk-based |
| 5 | Optimising | Continuous improvement, lessons learned, automated defence |
Many models (such as C2M2, CMMC and NIST) follow a similar structure and can be linked to frameworks such as NIST CSF or IEC 62443.
🏭 Use in industrial networks (OT)
- Maturity Level 1: OT management ad hoc, no access control on PLCs, no logging
- Levels 2–3: Patch management, Backup and Access Control implemented but inconsistent
- Level 4: Full Asset Inventory, SIEM, tested Incident Response
- Level 5: Automatic detection of anomalous behaviour (anomaly detection), lessons-learned cycles, OT Threat Intelligence
Use cases:
- Performing a gap analysis before IEC 62443 implementation
- Planning roadmaps for OT security improvements
- Reporting to auditors, customers and regulators (NIS2, FISMA)
🔍 Cybersecurity Maturity Model vs. framework
| Aspect | Maturity Model | Framework (such as NIST CSF) |
|---|---|---|
| Purpose | Measure progress and define a growth path | Structure and best practices for security |
| Levels | 1–5 or similar | No levels — domains and functions instead |
| Use | Internal assessment, roadmap | Implementation guidelines |
| Example use | ”We are at level 3 of 5" | "We apply Identify/Protect/Detect” |
🔐 Security considerations
- Maturity models help to set priorities based on maturity
- Support Defense in Depth, Zero Trust and Least Privilege
- Useful for supplier assessment and supply-chain risk
- Align with standards such as NIST SP 800-53, ISO 27001 and COBIT
- Essential for Risk Management and security budget planning
A maturity model is not an end in itself, but a tool for structural growth and risk-driven policy.
📌 In summary
A Cybersecurity Maturity Model helps organisations make their security level measurable and improve it in a targeted way. In OT environments, it provides a practical growth path that avoids over- or under-investing in security.