Redshift Publicly Accessible

What this rule checks

Detects Redshift clusters reachable from the public internet.

How to fix it

1. 1Set PubliclyAccessible: false
2. 2Use VPC endpoints, bastion hosts, or VPN for access

import { aws_ec2 as ec2, aws_redshift as redshift } from 'aws-cdk-lib';

const vpc = new ec2.Vpc(this, 'Vpc');

new redshift.CfnCluster(this, 'Cluster', {
  clusterType: 'single-node',
  nodeType: 'ra3.xlplus',
  masterUsername: 'admin',
  masterUserPassword: '{{resolve:secretsmanager:redshift:SecretString:password}}',
  dbName: 'analytics',
  publiclyAccessible: true,
});

import { aws_ec2 as ec2, aws_redshift as redshift } from 'aws-cdk-lib';

const vpc = new ec2.Vpc(this, 'Vpc');
const subnetGroup = new redshift.CfnClusterSubnetGroup(this, 'SubnetGroup', {
  description: 'Private subnets',
  subnetIds: vpc.privateSubnets.map((s) => s.subnetId),
});

new redshift.CfnCluster(this, 'Cluster', {
  clusterType: 'single-node',
  nodeType: 'ra3.xlplus',
  masterUsername: 'admin',
  masterUserPassword: '{{resolve:secretsmanager:redshift:SecretString:password}}',
  dbName: 'analytics',
  clusterSubnetGroupName: subnetGroup.ref,
  publiclyAccessible: false,
});

CDK Insights pinpoints the exact file and line in your CDK source for every finding, so you can jump straight to the fix.

Affected resource types

Intentional? Suppress this finding

Sometimes a flag is deliberate — a genuinely public endpoint, say. You can dismiss redshift-publicly-accessible and the reason is kept in the report, not silently hidden.

In .cdk-insights.json:

{
  "ignoreRules": [
    { "id": "redshift-publicly-accessible", "reason": "Why this is intentional" }
  ]
}

Or inline in your CDK code:

Validations.of(scope).acknowledge({
  id: 'cdk-insights::redshift-publicly-accessible',
  reason: 'Why this is intentional',
});

Use the rule ID redshift-publicly-accessible shown above — not the CDK-* ID from SARIF / GitHub code scanning. To dismiss every finding on one construct instead, use ignorePaths. Suppression docs →

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