MEDIUM SEVERITYCMSID: tumblr

Tumblr Dangling DNS Takeover Fingerprint

CNAME points to Tumblr edge without a registered blog mapping the custom domain.

Target CNAME Pattern

*.tumblr.com

Expected HTTP Status

404 Not Found

Vulnerable Body Signature String

“There's nothing here”

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

Remediation Guide & Mitigation

Action Required: Remove the CNAME DNS record.

Audit authoritative DNS zone records for any CNAME records pointing to *.tumblr.com.
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 Tumblr pointers, expired certificates, and dangling records 24/7.