The biggest problem is that SSLv2 can be attacked to obtain enough information about the private key to decrypt TLSv1.2 in realistic amounts of time. So even if

The biggest problem is that SSLv2 can be attacked to obtain enough information about the private key to decrypt TLSv1.2 in realistic amounts of time. So even if the client only uses secure protocols, the fact that the server supports SSLv2 means that the client's traffic is at risk.