CVE-2021-23018: F5 Nginx Controller

High severity, CVSS 7.4. EPSS: 0.5% chance of exploitation in the next 30 days.

Intra-cluster communication does not use TLS. The services within the NGINX Controller 3.x before 3.4.0 namespace are using cleartext protocols inside the cluster.

Affected products

• F5 Nginx Controller: from 3.0.0, up to and including 3.4.0

Published 2021-06-01. Last modified 2026-06-17.