{"id":"CVE-2020-9487","aliases":["BIT-nifi-2020-9487","GHSA-3pp3-77j6-8ph6"],"url":"https://o3.security/vulnerability/CVE-2020-9487","summary":"Missing Authentication for Critical Function in Apache NiFi","details":"In Apache NiFi 1.0.0 to 1.11.4, the NiFi download token (one-time password) mechanism used a fixed cache size and did not authenticate a request to create a download token, only when attempting to use the token to access the content. An unauthenticated user could repeatedly request download tokens, preventing legitimate users from requesting download tokens.","published":"2020-10-01T20:15:14.253Z","modified":"2026-07-08T17:57:14.085431Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.0305,"percentile":0.86503,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.nifi:nifi","fixedVersion":"1.12.0-RC1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://nifi.apache.org/security#CVE-2020-9487"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T17:57:14.085431Z"}}