CVE-2020-8561: Kubernetes

Medium severity, CVSS 4.1. EPSS: 2.1% chance of exploitation in the next 30 days.

A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

Affected products

• Kubernetes Kubernetes: version 1.20.11 only; version 1.21.5 only; version 1.22.2 only

Published 2021-09-20. Last modified 2026-06-17.