National Vulnerability Database. The U.S. government's catalogue of CVE entries with CVSS scoring.
The National Vulnerability Database (NVD), maintained by NIST, is the canonical structured catalogue of CVE (Common Vulnerabilities and Exposures) entries. Each NVD record includes the CVE id, a description, affected products (CPE), CVSS v2/v3 base scoring, references to vendor advisories, and CWE classification.
CloudSigma enriches new CVE references in the daily Intel feed against NVD before generating detection rules, so the rule's affected-products and severity context is sourced rather than guessed.