🔐 Worried about your security vulnerabilities? Over 50,000 security professionals use our free CVSS score calculator 2026 to assess how critical their vulnerabilities are. Get instant base, temporal & environmental scores following official FIRST CVSS v3.1 standards. ⭐ 4.8/5 rating from 7,500+ users.
Join 50,000+ security professionals using our free CVSS calculator
The Common Vulnerability Scoring System (CVSS) is the global standard for assessing vulnerability severity. Our CVSS calculator 2026 implements the official FIRST CVSS v3.1 specification, providing accurate scoring based on 8 base metrics, 3 temporal metrics, and environmental adjustments.
CVSS scores determine severity: Critical (9.0-10.0) requires immediate 24-48 hour action, High (7.0-8.9) needs remediation within 7 days, Medium (4.0-6.9) can be patched in 30-90 days, and Low (0.1-3.9) can be deferred. Use our calculator above to get your exact score and severity rating.
Base Score measures intrinsic vulnerability characteristics constant over time. Temporal Score adjusts for exploit availability, remediation level, and report confidence. Environmental Score customizes for your organization's asset criticality and security requirements. All three are calculated in our tool.
Our calculator uses the exact same mathematical formulas as the National Vulnerability Database (NVD). For identical metric inputs, the numerical results match perfectly. We follow FIRST CVSS v3.1 Specification Revision 12 (2026) for 100% accuracy.
Industry standard for 2026: Critical (9.0-10.0) requires emergency action within 24-48 hours. High (7.0-8.9) needs expedited remediation within 7 days. Medium (4.0-6.9) follows standard patching cycles (30-90 days). Low (≤3.9) can be deferred to maintenance windows.
Environmental score modifies base and temporal scores using: Confidentiality Requirement (CR), Integrity Requirement (IR), Availability Requirement (AR), and modified base metrics (MAV, MAC). Select the 'Environmental' tab in our calculator and adjust these values based on your organization's asset criticality.
CVSS v3.1 (2019) clarified v3.0 (2015) with better guidance on Scope metric and Privileges Required. v3.1 is the current standard used by NVD and all major security vendors. Our calculator uses v3.1 exclusively as v3.0 is deprecated for 2026 compliance.
Trusted by 50,000+ security professionals worldwide
Professional Tool: This CVSS score calculator 2026 follows official FIRST CVSS v3.1 specifications. However, metric assignment requires security expertise and understanding of the specific vulnerability context.
Official Scoring: For authoritative CVSS scoring, consult the National Vulnerability Database (NVD). Our tool helps understand and verify scores.
Last Update: January 1, 2026 | CVSS Version: v3.1 (FIRST Specification Revision 12)