The most blatant security backdoor yet seen in an internet router has been found in a range of models sold...

Over 20 Chinese-made Zbtlink router models contain a backdoor that could enable remote access to routers and connected devices, researchers said. | World News

At least 20 Zbtlink router models ship with ENDLESSDOORS, a root backdoor that attempts C2 contact as often as every 35 seconds and accepts commands.