CVE CVSS Score Interpreter & Risk Calculator
Interpret CVSS v3.1 base scores, calculate environmental risk adjustments, estimate patch urgency, and assess organizational exposure for any CVE vulnerability.
Formulas Used
CVSS v3.1 ISCBase:
ISCBase = 1 − [(1 − C) × (1 − I) × (1 − A)]
Impact Sub-Score (ISC):
• Scope Unchanged: ISC = 6.42 × ISCBase
• Scope Changed: ISC = 7.52 × (ISCBase − 0.029) − 3.25 × (ISCBase − 0.02)¹⁵
Exploitability Sub-Score (ESC):
ESC = 8.22 × AV × AC × PR × UI
CVSS v3.1 Base Score:
• Scope Unchanged: BaseScore = Roundup[min(ISC + ESC, 10)]
• Scope Changed: BaseScore = Roundup[min(1.08 × (ISC + ESC), 10)]
• If ISC ≤ 0: BaseScore = 0
Roundup = ceiling to nearest 0.1
Temporal Score:
TemporalScore = Roundup(BaseScore × E × RL × RC)
Organizational Risk Score (Environmental Heuristic):
OrgRisk = TemporalScore × AssetCriticality × Exposure × DataSensitivity
Patch Priority Score (0–100):
PatchPriority = min[(OrgRisk ÷ 10) × log₁₀(AffectedSystems + 1) × 20, 100]
Estimated Breach Cost Exposure (Heuristic):
BreachCost = $50,000 × OrgRisk × log₁₀(AffectedSystems + 1)
Assumptions & References
- All CVSS v3.1 metric weights and formulas follow the official FIRST CVSS v3.1 Specification.
- Severity thresholds: None (0.0), Low (0.1–3.9), Medium (4.0–6.9), High (7.0–8.9), Critical (9.0–10.0) per CVSS v3.1 standard.
- Temporal multipliers (E, RL, RC) are applied as defined in CVSS v3.1; "Not Defined" = 1.00 (no adjustment).
- Organizational Risk Score is a heuristic extension; it is not part of the official CVSS standard. It combines temporal score with environmental factors for prioritization purposes.
- Patch Priority Score uses a logarithmic scale for affected systems to prevent extreme values from dominating; log₁₀ is used per NIST SP 800-40 guidance on patch prioritization.
- Breach cost estimate is a simplified heuristic based on IBM Cost of a Data Breach Report 2023 ($4.45M average) scaled by risk and system count; not a financial guarantee.
- If a manual CVSS Base Score is entered, it overrides the calculated score for temporal and organizational calculations.
- References: NVD (NIST), FIRST CVSS, CISA KEV Catalog, IBM Cost of a Data Breach 2023.