//include the cvss.js script <script src="http://cvssjs.github.io/cvssjs/cvss.js"></script> craete an HTML element with an id for eg., <div id="cvssboard"/> // create a new instance of CVSS calculator: var c = new CVSS("cvssboard"); // create a new instance of CVSS calculator with some event handler callbacks var c = new CVSS("cvssboard", { onchange: function() {....} //optional onsubmit: function() {....} //optional } // set a vector c.set('CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L'); // it is also backwards compatible with CVSS v2 vectors, // buts only sets the parameters that can be set without ambiguity. c.set('AV:L/AC:L/Au:N/C:P/I:P/A:C'); //get the value c.get() returns an object like: { score: 4.3, vector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L' }