I think the real question is, are you using anything on your Buffalo product that MAKES it vulnerable...
If you dont use things like Remote Admin (IE accessing the Admin of the unit from OUTSIDE your local network), VPN, and a few other things, then it can have the flaw all it wants, but if its not externally accessible, its a non-issue...
Of course if your INTERNAL network gets compromised then they could exploit it from the local/internal network, but at that point, a 64k dump from your router is much less of an issue then the TROVES of information they can mine directly from your PC!
All that being said, asking for F/W updates from ANY company is like banging your head against a brick wall, trust me, my small network of Linksys router's are all now running UNSTABLE (by label only) DD-WRT TIP builds in order to keep up with the advancements and fix's the DD-WRT community provides...