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Servers and applications

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.

Severity
High 7.5
Published
6 Jul 2016
Last changed
17 Jun 2026
Added to UpHeron
17 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
Apache HTTP ServerServers and applications · cpe:a:apache:http_server
  • Version 2.4.18
  • Version 2.4.19
  • Version 2.4.20

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-4979
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-4979