Google warns of unauthorized TLS certificates trusted by almost all OSes
The fact that it's CNNIC that has issued these dangerous certificates is not exactly relevant to the problem at hand; More than one root authority has made mistakes in delegation, and several have made the mistake of not checking the delegation bit and allowing third-parties to request intermediate certificates.Still, it bears repeating that CNNIC, which is effectively a branch of the chinese government, has a root certificate trusted by default in all the major browsers. Unless you regularly visit chinese websites, you should remove CNNIC from your browser trust list.