CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
A hidden, persistent backdoor was found in Yarbo firmware v2.3.9 that provides remote, unauthenticated (or weakly authenticated) access to privileged functionality. The backdoor is undocumented, cannot be disabled via user-facing settings, and survives factory reset and ordinary firmware updates.
AnalysisAI
Undocumented persistent backdoor in Yarbo firmware v2.3.9 grants remote privileged access that survives factory reset and firmware updates. The backdoor requires high-privilege authentication (CVSS PR:H) but provides complete system control once accessed. …
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RemediationAI
Within 24 hours: Inventory all Yarbo devices running firmware v2.3.9 and restrict administrative access to essential personnel only; enable logging of all administrative actions and access attempts. Within 7 days: Audit all high-privilege account activity for unauthorized access patterns; isolate affected Yarbo devices from critical network segments pending vendor remediation. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-28398
GHSA-pq5m-hxx2-xhw5