---
title: RDS instance uses a 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 > RDS instance uses a default port
---

# RDS instance uses a default port

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ().
{% /alert %}

{% /callout %}

## Metadata{% #metadata %}

**Id:** `2cb674f6-32f9-40be-97f2-62c0dc38f0d5`

**Cloud Provider:** AWS

**Platform:** Ansible

**Severity:** Low

**Category:** Networking and Firewall

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

- [Provider Reference](https://docs.ansible.com/ansible/latest/collections/amazon/aws/rds_instance_module.html#parameter-port)

### Description{% #description %}

Using the database engine's default port makes instances easy for attackers to discover and target with automated scanning and exploit tooling, increasing the likelihood of brute-force, credential stuffing, or other network-based attacks. For Ansible RDS tasks using the `amazon.aws.rds_instance` or `rds_instance` modules, the `port` property must not be set to the engine default. Choose a non-default port and ensure access is restricted at the network level (security groups/ACLs).

This rule flags module tasks where `port` equals the engine default: MySQL/MariaDB/Aurora = 3306, PostgreSQL = 5432, Oracle = 1521, and SQL Server = 1433. This check flags explicit `port` settings that match defaults. If `port` is omitted, the engine may still use its default port, so also verify engine behavior and enforce least-privilege network access.

Secure configuration example (MySQL using a non-default port):

```yaml
- name: Create RDS instance with non-default port
  amazon.aws.rds_instance:
    db_instance_identifier: my-db
    engine: mysql
    port: 3307
```

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

```yaml
- name: create minimal aurora instance in default VPC and default subnet group
  amazon.aws.rds_instance:
    engine: aurora
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster  # This cluster must exist - see rds_cluster to manage it
    backup_retention_period: 7
    port: 3307
```

```yaml
- name: create minimal aurora instance in default VPC and default subnet group2
  amazon.aws.rds_instance:
    engine: sqlserver-ee
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster  # This cluster must exist - see rds_cluster to manage it
    backup_retention_period: 7
    port: 1434
```

```yaml
- name: create minimal aurora instance in default VPC and default subnet group2
  amazon.aws.rds_instance:
    engine: postgres
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster  # This cluster must exist - see rds_cluster to manage it
    backup_retention_period: 7
    port: 5433
```

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

```yaml
- name: create minimal aurora instance in default VPC and default subnet group2
  amazon.aws.rds_instance:
    engine: postgres
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster  # This cluster must exist - see rds_cluster to manage it
    backup_retention_period: 7
    port: 5432
```

```yaml
- name: create minimal aurora instance in default VPC and default subnet group2
  amazon.aws.rds_instance:
    engine: oracle-ee
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster  # This cluster must exist - see rds_cluster to manage it
    backup_retention_period: 7
    port: 1521
```

```yaml
- name: create minimal aurora instance in default VPC and default subnet group2
  amazon.aws.rds_instance:
    engine: sqlserver-ee
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster  # This cluster must exist - see rds_cluster to manage it
    backup_retention_period: 7
    port: 1433
```