CVE-2020-9491: Apache Nifi

High severity, CVSS 7.5. EPSS: 2.9% chance of exploitation in the next 30 days.

In Apache NiFi 1.2.0 to 1.11.4, the NiFi UI and API were protected by mandating TLS v1.2, as well as listening connections established by processors like ListenHTTP, HandleHttpRequest, etc. However intracluster communication such as cluster request replication, Site-to-Site, and load balanced queues continued to support TLS v1.0 or v1.1.

Affected products

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

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