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CVE-2026-66747 is a critical vulnerability in Zbtlink router firmware caused by an embedded remote-control implant known as ENDLESSDOORS. The implant is built into published firmware images across the product line as an OpenWrt package and is started automatically at boot. It runs with root privileges while masquerading as a kworker process. Rather than exposing an inbound service, it initiates outbound cleartext TCP connections to hardcoded command-and-control infrastructure, using one channel for command delivery and another for interactive shell access. The command handler passes received input directly to popen() as uid 0, and a reserved command triggers an interactive root shell. Because the control channel lacks both authentication and transport encryption, any actor able to control or intercept the configured command-and-control path can issue commands to the device and take full control.
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No public exploit code observed for this vulnerability.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An embedded malicious-code/backdoor vulnerability in Zbtlink router firmware in which the ENDLESSDOORS implant is built into published firmware images, runs as root at boot, and enables unauthenticated remote code execution via a cleartext hardcoded C2 channel.
A vulnerability/backdoored implant in Zbtlink router firmware where a bundled rctl-based component ('ENDLESSDOORS') phones home and accepts unauthenticated commands that are executed as root, including an interactive root shell.
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.