Calculate CVSS scores instantly with our free, accurate CVSS v3.1 calculator. Assess vulnerability severity, generate vector strings, and make informed security decisions for your organization.
How the vulnerability can be exploited
Conditions beyond the attacker's control that must exist
Level of privileges an attacker must possess
Whether a user must participate in the attack
Whether the vulnerability can affect components beyond its security scope
Impact to the confidentiality of information
Impact to the integrity of the system
Impact to the availability of the system
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Our calculator strictly follows the official CVSS v3.1 specification published by FIRST, ensuring accurate and standardized vulnerability scoring.
Get instant base score, impact score, and exploitability score calculations as you select metrics. No waiting, no delays.
Automatically generates the complete CVSS vector string for easy sharing, documentation, and integration with vulnerability management systems.
Color-coded severity ratings (None, Low, Medium, High, Critical) help you quickly understand the risk level of vulnerabilities.
No registration, no payment, no limits. Use our CVSS calculator as many times as you need for personal or professional purposes.
Designed for security professionals, IT teams, and vulnerability researchers who need quick, accurate CVSS scoring.
2. Configure Exploitability Metrics:
0.0 - None: No impact or completely theoretical vulnerability with no exploitability.
0.1 - 3.9 (Low): Limited impact vulnerabilities that are difficult to exploit or have minimal consequences.
4.0 - 6.9 (Medium): Moderate impact vulnerabilities that may require some conditions to exploit but pose real risks.
7.0 - 8.9 (High): Significant vulnerabilities that are easily exploitable or have serious impact on systems.
9.0 - 10.0 (Critical): Severe vulnerabilities that are trivial to exploit and have catastrophic consequences.
Be consistent: Use the same criteria when scoring similar vulnerabilities across your organization to maintain standardized risk assessment.
Consider context: While CVSS provides a base score, always factor in your organization's specific environment and threat landscape.
Document assumptions: Record the reasoning behind each metric selection for future reference and audit trails.
Use temporal metrics: Consider implementing temporal metrics (exploit code maturity, remediation level, report confidence) for more dynamic scoring.
Combine with risk assessment: CVSS scores should be one component of your overall vulnerability risk assessment process.
Regular reviews: Periodically review CVSS scores as new exploit information or patches become available.
CVSS (Common Vulnerability Scoring System) is an industry-standard framework for rating the severity of security vulnerabilities. It provides a standardized way to assess and communicate the characteristics and impacts of IT vulnerabilities, helping organizations prioritize remediation efforts and allocate security resources effectively.
CVSS v3.1 introduced refinements to the scoring formula and clarified metric definitions compared to v3.0. It provides more accurate scoring for vulnerabilities with changed scope and improved guidance on metric selection. Version 3.1 is currently the most widely adopted CVSS standard in the security industry.
Our calculator uses the official CVSS v3.1 specification formulas published by FIRST (Forum of Incident Response and Security Teams). The calculations are identical to those used by the NVD (National Vulnerability Database) and other authoritative sources, ensuring 100% accuracy in score computation.
Yes, CVSS scores are widely accepted in compliance frameworks including PCI DSS, ISO 27001, NIST, and SOC 2. Many organizations use CVSS as part of their vulnerability management and risk assessment processes to demonstrate due diligence in security practices.
A CVSS vector string is a compressed textual representation of all the metrics used to calculate a CVSS score. For example: "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H". This string allows you to share the complete vulnerability assessment in a standardized, machine-readable format that can be imported into vulnerability management systems.
While CVSS scores are important, they should be combined with contextual factors like asset criticality, threat intelligence, exploitability in your environment, and business impact. A Critical CVSS score on an isolated test system may be lower priority than a Medium score on a critical production server. Use CVSS as a guide, not the sole decision-making factor.