Chinese-Made Zbtlink Routers Ship With Backdoor That Opens Unauthenticated Root Shells

Cybersecurity researchers have disclosed details of a "factory-shipped backdoor" implanted in at least 20 Chinese router models from Zbtlink. According to a new report from VulnCheck, the implant appears in all 21 firmware images currently available from Zbtlink that span more than 2 years. The...

CVE-2026-66747 ENDLESSDOORS: Zbtlink Router rctl/kworker Phone-Home Root Implant

Zbtlink router firmware ships an embedded remote-control implant, ENDLESSDOORS, present in every published build across the product line. It is the open-source ycsunjane/rctl tool built in as an OpenWrt package librctl.so, started at boot and run as root under the process name kworker to blend in...

CVE-2025-25736

The CVE-2025-25736 entry affects Kapsch TrafficCom RIS-9260 RSU LEO software versions 3.2.0.829.23, 3.8.0.1119.42, and 4.6.0.1211.28. The root cause is pre-installed and enabled Android Debug Bridge (ADB) at /mnt/c3platpersistent/opt/platform-tools/adb, allowing unauthenticated root shell access ...