MEDIUM SEVERITYCMSCVSS 7.5Immediate (<90s)ID: tumblr
Tumblr Dangling DNS & Takeover Fingerprint
CNAME points to Tumblr edge without a registered blog mapping the custom domain.
DNS CNAME Delegation Rules
*.tumblr.com
CNAME points to domains.tumblr.com. Returns 'There\'s nothing here'.
404 Not Found
Authoritative Response Token
“There's nothing here”
curl -sI http://subdomain.example.com | grep 'There\'s nothing here'When SubdomainWatch scanner identifies this response on an unresolved CNAME target, an automated alert is triggered within 800ms.
Remediation Guide & Defensive Action Plan
Immediate Action Required: Remove the CNAME DNS record.
Defensive Verification Checklist:
- Audit authoritative DNS zone records for any CNAME pointing to
*.tumblr.com. - Verify whether the target resource or bucket still exists under your organization's cloud tenant.
- If decommissioned, delete the DNS record immediately to close the public exposure window.
- Deploy a pre-merge IaC security gate (such as SubdomainWatch Takeover Guard) to intercept dangling records before pull requests merge.
Terraform Remediation Example
# Remove Tumblr CNAME record
ATTACK SURFACE DETECTION COMPARISON
Why Static DNS Scanners Miss Tumblr Takeovers
Passive DNS repositories like SecurityTrails and heavy scanners like Detectify record domain records retrospectively or trigger alert fatigue. SubdomainWatch conducts active recursive CNAME testing with zero false positives.
Tumblr Takeover FAQs
Marketing teams often created vanity subdomains in past years. Forgetting them leaves corporate domains exposed.
FREE UNRESTRICTED SCANNER
Scan Your Domain for Tumblr Orphans
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Related Cloud Provider Signatures (7)
View All 26 Signatures →CMSHIGH
Zendesk Help Center
*.zendesk.com
CMSHIGH
Cargo Collective
subdomain.cargocollective.com
CMSHIGH
Unbounce
*.unbouncepages.com
CMSHIGH
WordPress.com
*.wordpress.com
HOSTINGHIGH
Netlify
*.netlify.app
HOSTINGHIGH
Firebase Hosting
*.web.app / *.firebaseapp.com
CLOUDCRITICAL
AWS S3
*.s3.amazonaws.com / *.s3-website-*.amazonaws.com