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How about this one? If you know it or someone is author of the post, please leave link here. Thank you all.
weaknesses of most router that usually have common password like '12345'. I just read it yesterday, but don't remember where it is. (I still search to find it)
All half-way new router have a 'random' (not really random, more like derived from the MAC address) password.
But this doesn't matter anyway because router are (or better: should, if not misconfigured) not accessible from the internet.
There was a vulnerability (i think about 1-2 years ago) where some router were accessible from the internet due to a bug in a support protocol which should have been only accessible from the ISP network. This made them accessible from the internet.
The weak password can only be abused when in the same (local) network.. By the way.. passwords can be changed..