DDoS protection standard is not enabled for Azure Virtual Network, this may lead to DDoS attacks on underlying infrastructure.
In Azure Console -
In Terraform -
References:
https://learn.microsoft.com/en-us/azure/ddos-protection/ddos-protection-overview
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/virtual_network#ddos_protection_plan