IoT devices are becoming increasingly popular, with McKinsey & Company estimating that they will drive up to $12.6 trillion in economic value by 2030. However, the growth of IoT also brings new security challenges that need to be addressed. PKI is an essential component for securing an organization's IoT infrastructure, and EST is a popular protocol to facilitate automation and management of different devices. PKI supports various protocols, including ACME, SCEP, and EST, which are crucial for managing large volumes of certificates in IoT use cases. Automating the provisioning and rotation of PKI certificates on diverse devices helps reduce risk and allows IT teams to manage their PKI at scale. HashiCorp Vault supports PKI and certificate automation to secure diverse infrastructures, with EST now available as a beta feature for enhanced security and efficiency.