CVE-2016-4979

The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.

We have discovered 659,136 live websites that are affected by CVE-2016-4979.

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Affected Software

Product	Apache
Category	Web Servers
Vulnerable Domains	659,136 live websites (26% of Apache install base)
Vulnerable Versions	from 0 through 2.4.20
Vulnerable Versions Count	80 versions ( 66% of all versions)