NIST API
NIST (nist.gov) has 2 public methods: get vulnerability by CVE number and search vulnerabilities. Each costs 1 credit per completed run (1¢ with pay as you go); failed runs are free.
Unofficial. Not affiliated with or endorsed by NIST.
Methods
2Looks up one CVE on the National Vulnerability Database and returns its description, CVSS score and vector, attack conditions, weakness number, affected products, exploitation flag, dates and references.
Returns description, severity, CVSS score and vector, attack method, weakness number, affected products, known exploitation, dates, references
Readnvd.nist.gov/get_vulnerabilityFinds known vulnerabilities (CVEs) in the NVD that match a product or vendor name, newest first. Each CVE is flagged when it is in CISA's known exploited catalog.
Returns CVE number, severity, CVSS score, description, published date, affected versions, known-exploited flag, NVD link
Readnvd.nist.gov/search_vulnerabilities