HIGH SEVERITYCMSID: readme-io

Readme.io Dangling DNS Takeover Fingerprint

Documentation CNAME points to an unclaimed or deleted Readme project. Anyone can register the matching project subdomain on Readme.io.

Target CNAME Pattern

*.readme.io

Expected HTTP Status

404 Not Found

Vulnerable Body Signature String

“Project doesnt exist yet”

When SubdomainWatch scanner receives HTTP responses matching this token on a dangling CNAME, it raises a critical alert immediately.

Remediation Guide & Mitigation

Action Required: Delete the CNAME pointing to Readme.io or configure the project slug within your Readme.io dashboard.

Audit authoritative DNS zone records for any CNAME records pointing to *.readme.io.
Verify whether the corresponding target resource is still active in your cloud tenant.
If the service was deprecated, delete the DNS record immediately to prevent hijackers from claiming the endpoint.
Add automated continuous monitoring to alert before third parties can register matching resource names.

SubdomainWatch continuously monitors your DNS zones for orphaned Readme.io pointers, expired certificates, and dangling records 24/7.