NVD - National Vulnerability Database
NIST - National Institute of Standards and Technology
The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, misconfigurations, product names, and impact metrics.
There is a vulnerability API access to query NVD directly. It is available at Vulnerability API documentation. An example to retrieve CVE information in JSON format can be access at:
https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2022-1388
At the vulnerability metrics page, NVD is providing 2 CVSS calculators: CVSS_v2 and CVSS_v3.1 calculator, for product integration. For examples:
https://nvd.nist.gov/vuln-metrics/cvss/v2-calculator?name=CVE-2022-1388
https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?name=CVE-2022-1388
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