The Kubernetes API server component in versions prior to 1.15.9, 1.16.0-1.16.6, and 1.17.0-1.17.2 has been found to be vulnerable to a denial of service attack via successful API requests.
https://security.netapp.com/advisory/ntap-20200413-0003/
https://groups.google.com/forum/#%21topic/kubernetes-security-announce/2UOlsba2g0s