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CVE-2026-66747 is an embedded malicious-code issue in Zbtlink router firmware, tracked as ENDLESSDOORS. The firmware incorporates a customized build of the rctl remote-control utility that starts automatically during boot, executes as root, and masquerades as a user-space kworker process. The implant periodically establishes an outbound cleartext TCP command-and-control connection. Its protocol provides neither authentication nor transport encryption or endpoint identity verification. Commands received over that channel are passed to a shell through popen() with root privileges; a reserved command enables an interactive root shell. The implant was reported in published firmware images spanning more than 20 Zbtlink models, including potentially equivalent OEM and white-label devices.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A CVSS 9.3 factory-preinstalled firmware implant/backdoor in Zbtlink router firmware. It runs as root while masquerading as kworker, persists through an init script, and contacts hard-coded C2 infrastructure to accept unauthenticated root shell commands or establish an interactive reverse root shell.
A critical unauthenticated remote-control implant embedded in affected ZBT router firmware. It runs at boot, masquerades as a Linux kworker process, and can provide an attacker who hijacks its C2 communications with complete root-level control of the router.
A previously disclosed phone-home implant in ZBT/Zbtlink router firmware.
A vulnerability/backdoor condition in Zbtlink router firmware where the ENDLESSDOORS implant is embedded in affected firmware images, enabling unauthenticated remote root command execution via outbound C2 registration and interactive shell access.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.