The Common Vulnerability Scoring System (CVSS) base score calculator and validator library written in TypeScript.
CVSS outputs numerical scores, indicating severity of vulnerability, based on some principal technical vulnerability characteristics. Its outputs include numerical scores indicating the severity of a vulnerability relative to other vulnerabilities. Link
The CVSS v3 vector string begins with the label CVSS: and numeric representation of the version.
After version string, it contains a set of /-separated CVSS metrics.
Each metric consists of name and value (both abbreviated) separated with ':'.
Sample CVSS v3.1 vector string: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
CVSS specification defines three metric groups: Base, Temporal, and Environmental, but only Base metrics are supported by given library for now.
Supported CVSS versions: 3.0 and 3.1
npm i --save @neuralegion/cvss
Score Calculator
calculateBaseScore(cvssString): number
Calculates Base Score, which depends on sub-formulas for Impact Sub-Score (ISS), Impact, and Exploitability,
calculateIss(metricsMap): number
Calculates Impact Sub-Score (ISS)
calculateImpact(metricsMap, iss): number
Calculates Impact
calculateExploitability(metricsMap): number
Calculates Exploitability
Validator
validate(cvssString): void
Throws an Error if given CVSS string is either invalid or unsupported.
Error contains verbose message with error details. Sample error messages:
- CVSS vector must start with "CVSS:"
- Invalid CVSS string. Example: CVSS:3.0/AV:A/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
- Unsupported CVSS version: 2.0. Only 3.0 and 3.1 are supported
- Duplicated metric: "AC:L"
- Missing mandatory CVSS base metric C (Confidentiality)
- Unknown CVSS metric "X". Allowed metrics: AV, AC, PR, UI, S, C, I, A
- Invalid value for CVSS metric PR (Privileges Required): Y. Allowed values: N (None), L (Low), H (High)
Humanizer
humanizeBaseMetric(metric)
Return un-abbreviated metric name: e.g. 'Confidentiality' for input 'C'
humanizeBaseMetricValue(value, metric)
Return un-abbreviated metric value: e.g. 'Network' for input ('AV', 'N')
ECMAScript 2015, Typescript modules
import { calculateBaseScore } from 'cvss';
console.log('score: ', calculateBaseScore('CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'));
NodeJS (CommonJS module)
const cvss = require('cvss');
console.log(cvss.calculateBaseScore('CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'));
NodeJS (experimental ESM support)
usage.mjs file:
import cvss from 'cvss';
console.log(cvss.calculateBaseScore('CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'));
Running: node --experimental-modules ./usage.mjs
Browser (globals from umd bundle)
<script src="./node_modules/cvss/dist/bundle.umd.js"></script>
<script>
alert(`Score: ${cvss.calculateBaseScore('CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N')}`);
</script>
Browser (ES modules)
<script type="module">
import { calculateBaseScore } from './node_modules/cvss/dist/bundle.es.js';
alert(`Score: ${calculateBaseScore('CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N')}`);
</script>
Issues and pull requests are highly welcome. 👍
Please, don't forget to lint (npm run lint) and test (npm t) the code.
Copyright © 2020 NeuraLegion.
This project is licensed under the MIT License - see the LICENSE file for details.
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