The bugzilla thread is an interesting read. And to be fair, the issue with the thousands of certificates is explained in it. It appears that the certificate is

The bugzilla thread is an interesting read. And to be fair, the issue with the thousands of certificates is explained in it. It appears that the certificate is used to sign DFN, which in turn signs certificates for most German universities. Btw, Video of the 27C3 talk in question: https://www.youtube.com/watch?v=DRjNV4YMvHI https://www.youtube.com/watch?v=DRjNV4YMvHI