No Public Ip Subnet

Instances in a subnet should not receive a public IP address by default.

You should limit the provision of public IP addresses for resources. Resources should not be exposed on the public internet, but should have access limited to consumers required for the function of your application.

Impact

The instance is publicly accessible

Recommended Actions

Follow the appropriate remediation steps below to resolve the issue.

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Resources:
  GoodExample:
    Properties:
      VpcId: vpc-123456
    Type: AWS::EC2::Subnet

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 resource "aws_subnet" "good_example" {
	vpc_id                  = "vpc-123456"
	map_public_ip_on_launch = false
 }
 

Links

• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html#concepts-public-addresses