High severity7.5NVD Advisory· Published Jul 6, 2016· Updated May 6, 2026
CVE-2016-4979
CVE-2016-4979
Description
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.
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
25- httpd.apache.org/security/vulnerabilities_24.htmlnvdPatchVendor Advisory
- packetstormsecurity.com/files/137771/Apache-2.4.20-X509-Authentication-Bypass.htmlnvd
- seclists.org/fulldisclosure/2016/Jul/11nvd
- www.apache.org/dist/httpd/CHANGES_2.4nvd
- www.openwall.com/lists/oss-security/2016/07/05/5nvd
- www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.htmlnvd
- www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.htmlnvd
- www.securityfocus.com/bid/91566nvd
- www.securitytracker.com/id/1036225nvd
- access.redhat.com/errata/RHSA-2016:1420nvd
- github.com/apache/httpd/commit/2d0e4eff04ea963128a41faaef21f987272e05a2nvd
- lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3Envd
- lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Envd
- security.gentoo.org/glsa/201610-02nvd
- security.netapp.com/advisory/ntap-20180601-0001/nvd
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