---
title: Redshift using default port
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > Code Security > Infrastructure as Code (IaC)
  Security > IaC Security Rules > Redshift using default port
---

# Redshift using default port

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## Metadata{% #metadata %}

**Id:** `terraform-aws-redshift-using-default-port` 

**Provider:** AWS

**Platform:** Terraform

**Severity:** Low

**Category:** Networking and Firewall

#### Learn More{% #learn-more %}

- [Provider Reference](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/redshift_cluster#port)

### Description{% #description %}

Amazon Redshift clusters listen on a default port (`5439`) unless otherwise specified using the `port` attribute in Terraform. Using the default port increases the risk of brute-force and automated attacks, as malicious actors frequently scan for commonly used service ports. Setting a custom port adds an obscurity layer by making the service less predictable to attackers, thereby reducing its exposure to opportunistic network attacks.

## Compliant Code Examples{% #compliant-code-examples %}

```terraform
resource "aws_redshift_cluster" "negative1" {
  cluster_identifier    = "tf-redshift-cluster"
  database_name         = "mydb"
  master_username       = "foo"
  master_password       = "Mustbe8characters"
  node_type             = "dc1.large"
  cluster_type          = "single-node"
  publicly_accessible   = false
  port                  = 1150
}
```

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```terraform
resource "aws_redshift_cluster" "positive1" {
  cluster_identifier    = "tf-redshift-cluster"
  database_name         = "mydb"
  master_username       = "foo"
  master_password       = "Mustbe8characters"
  node_type             = "dc1.large"
  cluster_type          = "single-node"
  publicly_accessible   = false
}
```

```terraform
resource "aws_redshift_cluster" "positive2" {
  cluster_identifier    = "tf-redshift-cluster"
  database_name         = "mydb"
  master_username       = "foo"
  master_password       = "Mustbe8characters"
  node_type             = "dc1.large"
  cluster_type          = "single-node"
  publicly_accessible   = false
  port                  = 5439
}
```