It’s obviously still a major privacy concern, but not really in the sense that a hacker can use it to gain access to your data or anything of the sorts. It’s more about knowing your location, ID you and possibly, choosing which ads to serve to you afterwards. But does it matter? Yes, but not really in the way you may think.
The moment a device is connected to a WiFi network, the WiFi MAC address becomes known to the other devices within the local LAN, so, if you decide to connect your smartphone to an Airport or hotel WiFi network, the admin can see the MAC address of your handset. What can happen when someone knows the MAC address of my devices? Consequences of spoofing the MAC address.Changing the channel, but not the channel bandwidth.What can happen when someone knows the MAC address of my devices?.
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