Having a preconfigured randomly generated WPA2-PSK passphrase for wireless routers is basically a good idea since a vendor-generated passphrase can be much more secure than most user-generated passwords. However, in the case of Belkin the default password is calculated solely based on the MAC address of the device. Since the MAC address is broadcasted with the beacon frames sent out by the device, a wireless attacker can calculate the default passphrase and then connect to the wireless network. Vulnerable versions include, but are not limited to, Belkin Surf N150 Model F7D1301v1, Belkin N900 Model F9K1104v1, Belkin N450 Model F9K1105V2, and possibly Belkin N300 Model F7D2301v1.
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