The source code of this software is here: https://github.com/monarc-project/stats-service
Licensed under Affero GPL v3.
It is a decentralized service which can aggregate different kind stats about threats and vulnerabilities. Here is more information: https://www.monarc.lu/documentation/stats-service/master/architecture.html if you want to understand the details.
of course, you can clone/fork the repository as you want.