Some Kubernetes CVEs don't appear on the official feed

[raesene]

Looking at the official CVE feed here there's a couple of CVEs that don't appear to be present.

• CVE-2020-8561
• CVE-2020-8562
• CVE-2021-25740

On a quick note related to these issues and also CVE-2020-8554, AFAIK all 4 of them have no patch so should be marked as present in every k8s version since their discovery.

cc @tabbysable just the follow-up from our chat at SIG-Security.