that How is it possible that a domain like https://www.voo.st can use a SSL certificate that is issued for https://ssl2224.cloudflare.com (inspect certificate) without the browser given any warnings?
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This certificate is valid for all the following names, present in the Subject Alternative Names extension:
Note that, in this case, the
CN=RDN of the Subject DN shouldn’t be used, but this doesn’t matter sincessl2224.cloudflare.comis in both places anyway. See RFC 2818 Section 3.1 for the validation rules (or RFC 6125):