{"id":"CVE-2016-4979","details":"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.","modified":"2026-05-14T04:00:37.302741463Z","published":"2016-07-06T14:59:04.487Z","related":["openSUSE-SU-2024:10268-1"],"database_specific":{},"references":[{"type":"WEB","url":"http://packetstormsecurity.com/files/137771/Apache-2.4.20-X509-Authentication-Bypass.html"},{"type":"WEB","url":"http://seclists.org/fulldisclosure/2016/Jul/11"},{"type":"WEB","url":"http://www.apache.org/dist/httpd/CHANGES_2.4"},{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2016/07/05/5"},{"type":"WEB","url":"http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html"},{"type":"WEB","url":"http://www.securityfocus.com/bid/91566"},{"type":"WEB","url":"http://www.securitytracker.com/id/1036225"},{"type":"WEB","url":"https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E"},{"type":"ADVISORY","url":"http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2016:1420"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/201610-02"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20180601-0001/"},{"type":"FIX","url":"http://httpd.apache.org/security/vulnerabilities_24.html"},{"type":"FIX","url":"https://github.com/apache/httpd/commit/2d0e4eff04ea963128a41faaef21f987272e05a2"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/httpd","events":[{"introduced":"0"},{"last_affected":"b7ef32c4957883ab17105fa82e6331bf48bed78a"},{"last_affected":"fd7b5c2c8b7549905ada63869757eac5c74d1c73"},{"last_affected":"6e65a7f3dadcade4274ae53f734d4c35188e3786"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"2.4.18"},{"last_affected":"2.4.19"},{"last_affected":"2.4.20"}],"source":"CPE_FIELD","cpe":["cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*","cpe:2.3:a:apache:http_server:2.4.19:*:*:*:*:*:*:*","cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:*"]}}],"versions":["2.4.20","2.4.19","2.4.18"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2016-4979.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}