{"id":"CVE-2017-9789","aliases":["ALPINE-CVE-2017-9789","BELL-CVE-2017-9789","EUVD-2017-18717","GHSA-p7q7-pxmj-xgvj","MGASA-2017-0298","SUSE-SU-2018:0261-1"],"status":"published","title":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26...","description":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.","severity":{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.09507,"percentile":0.95478,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2017-07-13T16:00:00Z","modified":"2026-10-24T10:30:54Z","fixes":[{"ecosystem":"Alpine:v3.3","package":"apache2","fixed_in":["2.4.27-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.4","package":"apache2","fixed_in":["2.4.27-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.5","package":"apache2","fixed_in":["2.4.27-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.6","package":"apache2","fixed_in":["2.4.27-r0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.3","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.27-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.4","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.27-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.5","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.27-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.6","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.27-r0"}]}]},{"source":"osv","ecosystem":"Mageia:6","package":"apache","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.27-1.mga6"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.23-29.13.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Software Development Kit 12 SP2","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.23-29.13.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Software Development Kit 12 SP3","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.23-29.13.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 12 SP2","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.23-29.13.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 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server"}],"references":[{"url":"https://lists.apache.org/thread.html/9d0098775bd83cf7c33ac5a077ef412c14ce939198921e639c734e20%40%3Cannounce.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://support.apple.com/HT208221","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://www.securityfocus.com/bid/99568","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbux03908en_us","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"https://security.netapp.com/advisory/ntap-20170911-0002/","tags":["x_refsource_CONFIRM","x_transferred","advisory"]},{"url":"https://httpd.apache.org/security/vulnerabilities_24.html","tags":["x_refsource_CONFIRM","x_transferred","Release Notes","Vendor Advisory","advisory","web"]},{"url":"https://security.gentoo.org/glsa/201710-32","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","advisory"]},{"url":"http://www.securitytracker.com/id/1038907","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/r15f9aa4427581a1aecb4063f1b4b983511ae1c9935e2a0a6876dad3c%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-9789"},{"url":"https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/9d0098775bd83cf7c33ac5a077ef412c14ce939198921e639c734e20@%3Cannounce.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/r15f9aa4427581a1aecb4063f1b4b983511ae1c9935e2a0a6876dad3c@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9@%3Ccvs.httpd.apache.org%3E"},{"url":"https://lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770@%3Ccvs.httpd.apache.org%3E"},{"url":"https://security.netapp.com/advisory/ntap-20170911-0002"},{"url":"https://github.com/advisories/GHSA-p7q7-pxmj-xgvj"},{"url":"https://security.alpinelinux.org/vuln/CVE-2017-9789","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2017-9789","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2017-0298.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=21500","tags":["report"]},{"url":"http://www.apache.org/dist/httpd/Announcement2.4.html","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2018/suse-su-20180261-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1042037","tags":["report"]},{"url":"https://bugzilla.suse.com/1045160","tags":["report"]},{"url":"https://bugzilla.suse.com/1048575","tags":["report"]},{"url":"https://bugzilla.suse.com/1057406","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2017-7659","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-9789","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2017-9789","description":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.","status":"published","published":"2017-07-13T16:00:00Z","modified":"2024-09-16T20:22:58.028Z","updated_at":"2026-11-02T14:33:13.96587Z"}],"euvd":[{"id":"EUVD-2017-18717","description":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.","status":"published","published":"2017-07-13T16:00:00Z","modified":"2024-09-16T20:22:58Z","updated_at":"2026-11-03T00:55:14.527578Z"}],"ghsa":[{"id":"GHSA-p7q7-pxmj-xgvj","title":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26...","description":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.","status":"published","published":"2022-05-13T01:09:41Z","modified":"2025-04-20T03:41:48Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:01:49.006624Z"}],"nvd":[{"id":"CVE-2017-9789","description":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.","status":"published","published":"2017-07-13T16:29:00.257Z","modified":"2026-06-17T01:28:54.733Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:03:54.012105Z"}],"osv":[{"id":"ALPINE-CVE-2017-9789","description":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.","status":"published","published":"2017-07-13T16:29:00.257Z","modified":"2026-06-15T18:26:04.758650088Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:47.187336Z"},{"id":"BELL-CVE-2017-9789","title":"CVE-2017-9789 does not affect BellSoft software","status":"withdrawn","published":"2017-07-13T16:29:00Z","modified":"2026-01-26T09:49:40.893433Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:14.701973Z"},{"id":"CVE-2017-9789","description":"When under stress, closing many connections, the HTTP/2 handling code in Apache httpd 2.4.26 would sometimes access memory after it has been freed, resulting in potentially erratic behaviour.","status":"published","published":"2017-07-13T16:29:00.257Z","modified":"2026-10-24T10:30:54.432941339Z","cvss":[{"version":"3.0","score":7.5,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:07.192756Z"},{"id":"MGASA-2017-0298","title":"Updated apache packages fix security vulnerabilities","description":"In Apache httpd before 2.4.27, the value placeholder in\n[Proxy-]Authorization headers of type 'Digest' was not initialized or\nreset before or between successive key=value assignments by\nmod_auth_digest. Providing an initial key with no '=' assignment could\nreflect the stale value of uninitialized pool memory used by the prior\nrequest, leading to leakage of potentially confidential information, and\na segfault in other cases resulting in denial of service\n(CVE-2017-9788).\n\nWhen under stress, closing many connections, the HTTP/2 handling code in\nApache httpd 2.4.26 would sometimes access memory after it has been\nfreed, resulting in potentially erratic behavior (CVE-2017-9789).\n","status":"published","published":"2017-08-24T07:52:24Z","modified":"2026-04-16T06:25:06.322269688Z","updated_at":"2026-11-02T15:49:40.442238Z"},{"id":"SUSE-SU-2018:0261-1","title":"Recommended update for apache2","description":"This update for apache2 fixes several issues.\n\nThese security issues were fixed:\n\n- CVE-2017-9789: When under stress (closing many connections) the HTTP/2\n  handling code would sometimes access memory after it has been freed, resulting\n  in potentially erratic behaviour (bsc#1048575).\n- CVE-2017-7659: A maliciously constructed HTTP/2 request could cause mod_http2\n  to dereference a NULL pointer and crash the server process (bsc#1045160).\n\nThese non-security issues were fixed:\n\n- Use the full path to a2enmod and a2dismod in the apache-22-24-upgrade script (bsc#1042037)\n- Fall back to 'localhost' as hostname in gensslcert (bsc#1057406)\n","status":"published","published":"2018-01-29T10:41:29Z","modified":"2026-02-04T03:35:59.152628Z","updated_at":"2026-11-02T15:53:44.594517Z"}]}}