Specifically, the exploit, dubbed KrØØk allowed hackers to tinker with the encryption of data communicated between a device and the router, causing it to change from a random string of characters to all zeroes and effectively rending the encryption useless.
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'This results in scenarios where client devices that are unaffected (either patched or using different Wi-Fi chips not vulnerable to Kr00k) can be connected to an access point (often times beyond an individual's control) that is vulnerable,' researchers wrote in a research paper.