Here is a shorter article that summarizes the core security issues and the Chinese company not fixing known security flaws of the TP-Link routers.
The legitimate concern is any vendor that is knowingly selling their products with known security issues and purposely not going to patch their products.More moral panic in the US over things "China" related at the moment... whether it's Huawei, ZTE, others - just earlier today, more sanctions against China Telecom doing business in the US - it's just a thing, and I get it.
Mixed feelings here, as there is legit concern for any consumer networking gear having security issues - the code is complex because of creeping features - e.g. let's do network VPN, filesharing, let's open up the code for third party scripts, etc...
TP_link isn't the only one there - and we've seen more that a fair share of issues with other vendors such as Netgear, Cisco, etc...
Some of the issues are upstream in the Chipset Vendor SDK's, others are inside the Vendor code, and of course, for more "open" devices, the third party scripts that are resistant to audits.
Again, as I say, Moral Panic - are they legit bugs, or are they intentional backdoors? If we go down that path of backdoor issues, then gear from every company is suspect...
If the shoe were on the other foot, what do you think China would being recommending right now?
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