CVE-2020-9487: Apache Nifi

High severity, CVSS 7.5. EPSS: 3.1% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Nifi: from 1.0.0, up to and including 1.11.4

Published 2020-10-01. Last modified 2026-06-17.