Cvss V3.0 Calculator
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Reviewed by Calculator Editorial Team
CVSS (Common Vulnerability Scoring System) v3.0 is an industry standard for assessing the severity of software vulnerabilities. This calculator helps you determine the CVSS base score based on the vulnerability's characteristics.
What is CVSS v3.0?
CVSS v3.0 is a standardized method for measuring the severity of security vulnerabilities. It provides a numerical score (0-10) that helps organizations prioritize remediation efforts. The score is calculated based on three metric groups: Base, Temporal, and Environmental.
Key Features of CVSS v3.0
- Standardized scoring system recognized by industry and government
- Three metric groups: Base, Temporal, and Environmental
- Score ranges from 0 (no impact) to 10 (critical vulnerability)
- Used by vulnerability databases like NVD (National Vulnerability Database)
The Base group metrics are the most important as they represent the inherent characteristics of a vulnerability. The Temporal and Environmental groups provide additional context based on time and the specific environment where the vulnerability exists.
How to Use This Calculator
To calculate a CVSS v3.0 score, you'll need to select values for the Base metrics. The calculator will then compute the Base Score, which ranges from 0 to 10. Higher scores indicate more severe vulnerabilities.
Example Calculation
For a vulnerability with:
- Attack Vector: Network (AV:N)
- Attack Complexity: Low (AC:L)
- Privileges Required: None (PR:N)
- User Interaction: None (UI:N)
- Scope: Unchanged (S:U)
- Confidentiality Impact: High (C:H)
- Integrity Impact: High (I:H)
- Availability Impact: High (A:H)
The calculated Base Score would be 9.8 (Critical severity).
After entering the metric values, click "Calculate" to see the result. You can reset the form with the "Reset" button if needed.
CVSS Metrics Explained
The CVSS v3.0 Base metrics are divided into three categories: Exploitability, Impact, and Scope.
| Metric Group | Description |
|---|---|
| Exploitability | Measures how the vulnerability can be exploited (Attack Vector, Attack Complexity, Privileges Required, User Interaction) |
| Impact | Measures the impact on confidentiality, integrity, and availability (Confidentiality Impact, Integrity Impact, Availability Impact) |
| Scope | Determines whether a vulnerability in one component impacts other components (Scope) |
Each metric has specific values that represent different levels of severity. The calculator uses these values to compute the final score.
Severity Rating Scale
The CVSS v3.0 score is rated on a scale from 0 to 10, with 10 being the most severe. The severity rating is determined as follows:
| Score Range | Severity Rating | Description |
|---|---|---|
| 0.0 | None | No impact |
| 0.1 - 3.9 | Low | Low severity vulnerability |
| 4.0 - 6.9 | Medium | Medium severity vulnerability |
| 7.0 - 8.9 | High | High severity vulnerability |
| 9.0 - 10.0 | Critical | Critical severity vulnerability |
Organizations typically prioritize vulnerabilities based on their severity rating. Critical vulnerabilities (9.0-10.0) often require immediate attention.
Example Calculations
Here are three example calculations demonstrating different severity levels:
Example 1: Low Severity (Score: 3.1)
- Attack Vector: Physical (AV:P)
- Attack Complexity: High (AC:H)
- Privileges Required: High (PR:H)
- User Interaction: Required (UI:R)
- Scope: Unchanged (S:U)
- Confidentiality Impact: Low (C:L)
- Integrity Impact: Low (I:L)
- Availability Impact: Low (A:L)
This represents a vulnerability that is difficult to exploit and has minimal impact.
Example 2: Medium Severity (Score: 5.3)
- Attack Vector: Local (AV:L)
- Attack Complexity: Low (AC:L)
- Privileges Required: Low (PR:L)
- User Interaction: None (UI:N)
- Scope: Unchanged (S:U)
- Confidentiality Impact: Low (C:L)
- Integrity Impact: Low (I:L)
- Availability Impact: High (A:H)
This represents a vulnerability that can be exploited locally and impacts availability significantly.
Example 3: Critical Severity (Score: 9.8)
- Attack Vector: Network (AV:N)
- Attack Complexity: Low (AC:L)
- Privileges Required: None (PR:N)
- User Interaction: None (UI:N)
- Scope: Changed (S:C)
- Confidentiality Impact: High (C:H)
- Integrity Impact: High (I:H)
- Availability Impact: High (A:H)
This represents a highly severe vulnerability that can be exploited remotely with minimal effort and impacts multiple components.
Frequently Asked Questions
- What is the difference between CVSS v2.0 and v3.0?
- CVSS v3.0 includes several improvements over v2.0, including a more comprehensive metric set, better alignment with real-world vulnerability characteristics, and a more nuanced scoring system.
- Can I calculate the Temporal and Environmental scores with this calculator?
- This calculator focuses on the Base Score metrics, which are the most important for understanding a vulnerability's inherent characteristics. Temporal and Environmental scores require additional context not provided by this calculator.
- How do I interpret the CVSS score?
- The CVSS score helps prioritize vulnerabilities. Higher scores indicate more severe vulnerabilities that should be addressed sooner. The severity rating scale provides guidance on how to interpret the numerical score.
- Is CVSS v3.0 the most current version?
- As of 2023, CVSS v3.1 is the most current version, but many organizations still use v3.0. The calculator follows the v3.0 specification.
- Where can I find more information about CVSS?
- The official CVSS documentation is available on the FIRST website. This calculator provides a simplified interface for calculating CVSS v3.0 scores.