According to this paper it is cracked: http://sviehb.files.wordpress.com/2011/12/viehboeck_wps.pdf
Using Reaver.
According to this paper it is cracked: http://sviehb.files.wordpress.com/2011/12/viehboeck_wps.pdf
Using Reaver.
Since the vulnerability reaver exploits is only in kind of authentication (PIN) the question should probably be rephrased to: Is WPS broken completely or only in parts.
Simple answer - no.
If you read that paper you linked to, it details the problem.
It hasn't been safe for a long time.