This is a WEP issue, but remember that WPA uses a shared secret also.
This is the kind of thing that makes it difficult to trust wireless
setups.
From bugtraq: "By default, the 40-bit WEP key for the wireless
router provided by Verizon to FiOS (fiber optic) and possibly DSL customers
is set to the last 40 bits of the router's 48-bit MAC address. This is
significant because the router's MAC address (the MAC address of it's WAN-side
ethernet port) is easily discoverable using kismet without even
needing to know the WEP key."
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