> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/appsec-rules/iac-security/public-exposure/appsec-aws-130.md).

# AWS VPC subnets should not allow automatic public IP assignment misconfiguration detected in code

## Rule Details

|                        |                                      |
| ---------------------- | ------------------------------------ |
| Cortex AppSec Rule ID  | APPSEC\_AWS\_130                     |
| Category - Subcategory | Public Exposure - VPC VCN VNet       |
| Provider               | AWS                                  |
| Severity               | LOW                                  |
| Framework              | Terraform, Terraform Plan            |
| Mapped CSPM/KSPM Rule  | 11743cd3-35e4-4639-91e1-bc87b52d4cf5 |

## Impact

VPC subnet is a part of the VPC having its own rules for traffic. Assigning the Public IP to the subnet automatically (on launch) can accidentally expose the instances within this subnet to internet and should be edited to 'No' post creation of the Subnet.

## How to Fix

*Resource:* aws\_subnet

* *Arguments:* map\_public\_ip\_on\_launch \[source,go]

***

resource "aws\_subnet" "test" { ...

* map\_public\_ip\_on\_launch = false }

***


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