Visualizing Precision, Maturity, and Confidence

The UC2 Risk Ruler enhances the Common Vulnerability Scoring System (CVSS) version 4.0 by adding a visual representation of maturity, confidence, and precision to vulnerability scores. CVSS 4.0 provides a standardized set of qualitative severity labels — None, Low, Medium, High, and Critical — which map to numeric scores for assessing the potential severity of vulnerabilities. However, CVSS alone does not account for the difference between the exact numerical score (precision), the expert judgment regarding the assessment’s reliability (confidence), and the completeness of the available metric groups (maturity). The UC2 Risk Ruler bridges this gap, allowing stakeholders to see not only how a CVSS numeric score aligns with bins that reflect uncertainty, but also explicitly distinguishes between the score’s numerical exactness and the completeness of its underlying metric groups. This added dimension supports more transparent and defensible cybersecurity decision-making.