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CVE-2026-66747 describes an embedded remote-control implant, ENDLESSDOORS, shipped within Zbtlink router firmware across the product line. The implant is a packaged form of the open-source rctl remote-control tool integrated into the firmware, launched automatically at boot, and executed with root privileges while masquerading as a kworker process. Rather than exposing an inbound service, it initiates periodic outbound cleartext TCP connections to hardcoded command-and-control infrastructure. The protocol provides no authentication, encryption, or meaningful endpoint verification. Received command strings are passed directly to popen() as uid 0, and a reserved command triggers an interactive root shell callback. Because the control channel is embedded in vendor firmware and trusts any responder on the configured path, the issue functions as a built-in backdoor that enables remote takeover of affected devices.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A hidden backdoor/remote-control implant embedded in Zbtlink router firmware that launches at boot, connects outbound to command-and-control infrastructure, and allows remote command execution and interactive root shell access with full administrative privileges.
A backdoored firmware issue in Zbtlink routers in which the ENDLESSDOORS implant starts at boot, connects outbound to command-and-control infrastructure, and enables remote command execution and interactive root shell access on affected devices.
A built-in firmware backdoor in Zbtlink/Wiflyer routers that phones home to hardcoded endpoints and allows unauthenticated remote command execution or an interactive root shell as root.
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.