What is FISMA?
FISMA stands for Federal Information Security Modernization Act and is a US law that requires organisations to manage and document information security in a structured way. FISMA applies to federal agencies and their suppliers and requires the implementation of appropriate, risk-based security controls.
FISMA is closely linked to NIST SP 800-53 and forms the legal basis for applying cybersecurity frameworks in the public sector.
🧠 How does FISMA work?
- Risk-based approach
- Information and control systems are categorised (low, moderate, high risk)
- Implementing security controls
- Based on NIST SP 800-53 and other NIST guidelines
- Assessing and testing controls
- Through audits, assessments and penetration testing
- Authorisation to Operate (ATO)
- Systems may only go live once they meet the established requirements
- Continuous monitoring
- Periodic evaluation of security, SIEM, logging, incident reporting
FISMA requires a documented, repeatable and auditable security approach.
🏭 Application in OT environments
Although FISMA primarily targets IT systems, it has increasing impact on OT networks, particularly in:
- Utilities, energy and water infrastructure operators that work with federal agencies
- Suppliers of components such as PLCs, RTUs or SCADA software
- Use of NIST SP 800-82 for applying controls to industrial networks
- Asset Inventory, Access Control, Backup, Incident Response required to be documented
- Alignment with NIST CSF, Zero Trust and Risk Management
Supplying the US government or military? FISMA compliance is often mandatory — including for OT.
🔍 FISMA vs. other frameworks
| Aspect | FISMA | NIST CSF | IEC 62443 |
|---|---|---|---|
| Type | Legislation (compliance mandatory) | Framework (voluntary application) | Standard (technical + policy) |
| Application | Federal systems and suppliers | Broadly applicable | Specific to OT and industrial environments |
| Base document | NIST SP 800-53 | NIST CSF | Zones, Conduits, Security Levels |
| OT relevance | Indirect, via NIST SP 800-82 | High | Very high |
🔐 Security aspects
- FISMA requires full documentation of security controls
- Helps organisations to systematically meet risk-management requirements
- Access Control, Audit, Change Management, Contingency Planning are mandatory
- Provides a legal framework for cybersecurity in the public and semi-public sectors
- Combinable with Zero Trust, SIEM, Incident Response and Business Continuity
FISMA forces organisations into mature governance and traceable cybersecurity decisions.
📌 In summary
FISMA is a US federal law that requires organisations to implement structured information security and risk management, based on NIST guidelines such as SP 800-53. Although originally aimed at IT, FISMA is becoming increasingly important for OT and industrial suppliers.