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US targets TP-Link with a potential ban on the Chinese routers
(www.theverge.com)
This is a most excellent place for technology news and articles.
I’m not sure, but with routers, I think OpenWRT installs/flashes at the firmware level. There could be hardware level vulnerabilities I suppose.
In the case of Lenovo laptops used in Iraq (2004), China had additional hardware chips snooping and sending data back via Ethernet cable.