{"cve":"CVE-2020-16904","nvd":{"published":"2020-10-16T23:15:13.960","modified":"2026-06-17T02:58:14.140","status":"Modified","description":"<p>An elevation of privilege vulnerability exists in the way Azure Functions validate access keys.</p>\n<p>An unauthenticated attacker who successfully exploited this vulnerability could invoke an HTTP Function without proper authorization.</p>\n<p>This security update addresses the vulnerability by correctly validating access keys used to access HTTP Functions.</p>","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-863"],"references":["https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16904","https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16904"],"products":["microsoft:azure_functions"],"source":"nvd","synced_at":"2026-10-19T21:09:53.489947993+00:00"},"epss":{"cve":"CVE-2020-16904","score":0.03373,"percentile":0.8876,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}