Security Risk Assessment
A structured process for identifying, analysing, and prioritising security risks to an organisation's assets, operations, and people.
What Is a Security Risk Assessment?
A security risk assessment is a systematic process of identifying threats to your organisation, evaluating the likelihood and impact of those threats materialising, and prioritising which risks require treatment. It forms the foundation of any structured security programme — you cannot manage risk you haven't identified.
The Risk Assessment Process
1. Define scope: What assets, systems, processes, and locations are in scope? Start with your most critical business systems.
2. Asset inventory: Catalogue what you're protecting — data, systems, applications, people, physical infrastructure.
3. Threat identification: What could go wrong? Common threats include ransomware, phishing, insider threats, vendor compromise, accidental data loss, and system failure.
4. Vulnerability identification: What weaknesses exist in your current controls that could be exploited by identified threats?
5. Risk analysis: For each threat/vulnerability combination, estimate:
- Likelihood: How probable is this risk materialising? (High/Medium/Low)
- Impact: What would the business consequence be? (High/Medium/Low)
- Risk rating: Likelihood × Impact → risk score or heat-map position
6. Risk treatment: For each prioritised risk, decide on an approach:
- Mitigate: Implement controls to reduce likelihood or impact
- Accept: Document and accept residual risks that fall below your threshold
- Transfer: Use insurance or contracts to transfer risk
- Avoid: Stop the activity that creates the risk
7. Risk register: Document all identified risks, their ratings, treatment decisions, and owners.
Why SMBs Often Skip Risk Assessments
Risk assessments feel abstract and time-consuming. But an unstructured security programme wastes resources on low-priority controls while missing critical ones. A basic risk assessment — even completed in a day — creates focus and justification for spending decisions.
Getting Started Without a Security Team
Use a structured framework like NIST CSF, Cyber Essentials, or ISO 27001's risk methodology as your template. Start with five to ten of your highest-value assets and most likely threats. A simple spreadsheet-based risk register is sufficient at this stage.