Introducing UltraDNS Dangling CNAME Detection

In today's digital landscape, ensuring DNS security is more crucial than ever. Attackers are constantly looking for vulnerabilities, and one often overlooked threat is dangling CNAME records—these are orphaned or misconfigured DNS entries that can be exploited for subdomain takeovers, phishing attacks, and brand impersonation.

To help our customers mitigate these risks, UltraDNS is launching Dangling CNAME Detection. This dedicated tool is designed to proactively scan for and identify these hidden security gaps with unmatched precision.

What Is a Dangling CNAME Record?

A Dangling CNAME record occurs when a CNAME points to a resource that is no longer active or claimed. This could happen due to:

Decommissioned cloud services
Expired third-party integrations
Unused or forgotten subdomains

Attackers can exploit these unclaimed records to gain control over subdomains, enabling them to host malicious content, conduct phishing attacks, or impersonate legitimate brands. These risks often go unnoticed without proactive monitoring—until it's too late.

How UltraDNS Dangling CNAME Detection Works

Our new Dangling CNAME Detection feature empowers organizations to identify and mitigate these vulnerabilities before they can be exploited. Here's how it works:

Automated Scanning: UltraDNS scans CNAME records and queries external recursive resolvers to check if they resolve or return an NXDOMAIN (non-existent domain) response, ensuring precise identification of security gaps.
Actionable Reporting: Customers receive detailed reports highlighting potential security risks, making reviewing and taking corrective action easy.
Proactive Protection: By addressing dangling CNAME records early, organizations can prevent subdomain hijacking, phishing, and other security threats.

Why This Matters for Your Business

Enhanced Security: Proactively identifies and mitigates DNS-based vulnerabilities before they are exploited.
Compliance & Risk Management: Helps organizations meet security and compliance requirements by maintaining proper DNS hygiene.
Brand Protection: Prevents malicious actors from using your domains for phishing or impersonation attacks.
Simple & Effective: Unlike broader security solutions, UltraDNS Dangling CNAME Detection is purpose-built for this specific risk, ensuring precise detection and easy remediation.

Get Started with Dangling CNAME Detection

Running a scan is simple! Customers can access Dangling CNAME Detection via:

The UltraDNS portal → Navigate to the 'Dangling DNS Records' tab and run a report to identify at-risk CNAMEs.
The UltraDNS API enables seamless integration into automated workflows and security monitoring systems for continuous protection.

If needed, the scan can be re-run to update findings after remediation.

This feature is another step toward ensuring stronger DNS security and protecting your brand. We encourage all UltraDNS users to leverage this tool to safeguard their domains and infrastructure.

We'd Love Your Feedback!

Security is a shared responsibility, and we're always looking to improve. Try Dangling CNAME Detection today, and let us know what you think! Drop your feedback in the comments or connect with us in the UltraDNS Community.

Ready to take action? Log in to UltraDNS or use the UltraDNS API to run your first scan today!