- [Changelog since v1.21.4](#changelog-since-v1214)
  - [Important Security Information](#important-security-information)
    - [CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access](#cve-2021-25741-symlink-exchange-can-allow-host-filesystem-access)
  - [Changes by Kind](#changes-by-kind-8)
    - [Feature](#feature-6)
    - [Bug or Regression](#bug-or-regression-8)

    * configuration scripts to allow configuration of signing duration of
    * certificates issued via the Certificate Signing Request API.

* GCP: allow a master to not include a metadata concealment firewall rule (if it's not running the metadata proxy). ([#58104](https://github.com/kubernetes/kubernetes/pull/58104), [@ihmccreery](https://github.com/ihmccreery))

- Enable external plugins can be used as subcommands for kubectl create command if subcommand does not exist as builtin only when KUBECTL_ENABLE_CMD_SHADOW environment variable is exported. ([#116293](https://github.com/kubernetes/kubernetes/pull/116293), [@ardaguclu](https://github.com/ardaguclu))

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