{"id":"CVE-2023-4236","aliases":["ALPINE-CVE-2023-4236","BELL-CVE-2023-4236","DEBIAN-CVE-2023-4236","EUVD-2023-54109","GHSA-jhh4-vhhc-xpjq","MGASA-2023-0303","UBUNTU-CVE-2023-4236","USN-6390-1","openSUSE-SU-2024:13249-1"],"status":"published","title":"named may terminate unexpectedly under high DNS-over-TLS query load","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.02189,"percentile":0.82558,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-617"],"published":"2023-09-20T00:00:00Z","modified":"2026-10-26T18:02:32Z","fixes":[{"ecosystem":"Alpine:v3.17","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:23","package":"bind","fixed_in":["9.18.19-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"bind9","fixed_in":["1:9.18.19-1~deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"bind9","fixed_in":["1:9.19.17-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"bind9","fixed_in":["1:9.19.17-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"bind9","fixed_in":["1:9.18.12-0ubuntu0.22.04.3"],"sources":["osv"]},{"ecosystem":"Ubuntu:24.04:LTS","package":"bind9","fixed_in":["1:9.18.18-0ubuntu2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.17","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:23","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.18.11-r0"},{"fixed":"9.18.19-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.19-1~deb12u1"}]}],"versions":["1:9.18.12-1","1:9.18.13-1","1:9.18.16-1","1:9.18.16-1~deb12u1","1:9.18.16-1~deb12u1~bpo11+1","1:9.18.19-1~deb12u1~bpo11+1"]},{"source":"osv","ecosystem":"Debian:13","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.19.17-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.19.17-1"}]}]},{"source":"osv","ecosystem":"Mageia:9","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.18.15-2.2.mga9"}]}],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.12-0ubuntu0.22.04.3"}]}],"versions":["1:9.16.15-1ubuntu1","1:9.16.15-1ubuntu2","1:9.16.15-1ubuntu3","1:9.18.0-2ubuntu1","1:9.18.0-2ubuntu2","1:9.18.0-2ubuntu3","1:9.18.1-1ubuntu1","1:9.18.1-1ubuntu1.1","1:9.18.1-1ubuntu1.2","1:9.18.1-1ubuntu1.3","1:9.18.12-0ubuntu0.22.04.1","1:9.18.12-0ubuntu0.22.04.2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.18-0ubuntu2"}]}]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.16.1-0ubuntu2.16"}]}],"versions":["1:9.11.5.P4+dfsg-5.1ubuntu2","1:9.11.5.P4+dfsg-5.1ubuntu3","1:9.11.5.P4+dfsg-5.1ubuntu4","1:9.11.5.P4+dfsg-5.1ubuntu5","1:9.11.14+dfsg-1ubuntu1","1:9.11.14+dfsg-3ubuntu1","1:9.16.0-1ubuntu3","1:9.16.0-1ubuntu4","1:9.16.0-1ubuntu5","1:9.16.1-0ubuntu1","1:9.16.1-0ubuntu2","1:9.16.1-0ubuntu2.1","1:9.16.1-0ubuntu2.2","1:9.16.1-0ubuntu2.3","1:9.16.1-0ubuntu2.4","1:9.16.1-0ubuntu2.6","1:9.16.1-0ubuntu2.7","1:9.16.1-0ubuntu2.8","1:9.16.1-0ubuntu2.9","1:9.16.1-0ubuntu2.10","1:9.16.1-0ubuntu2.11","1:9.16.1-0ubuntu2.12","1:9.16.1-0ubuntu2.14","1:9.16.1-0ubuntu2.15"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"bind9","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:9.18.12-0ubuntu0.22.04.3"}]}],"versions":["1:9.16.15-1ubuntu1","1:9.16.15-1ubuntu2","1:9.16.15-1ubuntu3","1:9.18.0-2ubuntu1","1:9.18.0-2ubuntu2","1:9.18.0-2ubuntu3","1:9.18.1-1ubuntu1","1:9.18.1-1ubuntu1.1","1:9.18.1-1ubuntu1.2","1:9.18.1-1ubuntu1.3","1:9.18.12-0ubuntu0.22.04.1","1:9.18.12-0ubuntu0.22.04.2"],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"bind","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.18.19-1.1"}]}],"bundled":2}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"fedoraproject","product":"fedora"},{"vendor":"isc","product":"bind"},{"vendor":"isc","product":"bind 9"},{"vendor":"netapp","product":"h300s_firmware"},{"vendor":"netapp","product":"h410c_firmware"},{"vendor":"netapp","product":"h410s_firmware"},{"vendor":"netapp","product":"h500s_firmware"},{"vendor":"netapp","product":"h700s_firmware"}],"references":[{"url":"https://kb.isc.org/docs/cve-2023-4236","tags":["vendor-advisory","x_transferred","Vendor Advisory","advisory","report"]},{"url":"http://www.openwall.com/lists/oss-security/2023/09/20/2","tags":["x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://www.debian.org/security/2023/dsa-5504","tags":["x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IPJLLTJCSDJJII7IIZPLTBQNWP7MZH7F/","tags":["x_transferred","Mailing List","article"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U35OARLQCPMVCBBPHWBXY5M6XJLD2TZ5/","tags":["x_transferred","Mailing List","article"]},{"url":"https://security.netapp.com/advisory/ntap-20231013-0004/","tags":["x_transferred","Third Party Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSK5V4W4OHPM3JTJGWAQD6CZW7SFD75B/","tags":["x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-4236"},{"url":"https://github.com/advisories/GHSA-jhh4-vhhc-xpjq"},{"url":"https://security.alpinelinux.org/vuln/CVE-2023-4236","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2023-4236","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-4236","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2023-0303.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=32039","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-6390-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-4236","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-4236","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2023-3341","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2023-3341","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-4236","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2023-4236","title":"named may terminate unexpectedly under high DNS-over-TLS query load","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T12:32:16.631Z","modified":"2025-02-13T17:09:18.327Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:35:30.116696Z"}],"euvd":[{"id":"EUVD-2023-54109","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T12:32:16Z","modified":"2025-02-13T17:09:18Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:03:49.098775Z"}],"ghsa":[{"id":"GHSA-jhh4-vhhc-xpjq","title":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate...","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T15:30:51Z","modified":"2023-11-03T21:30:20Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:54:48.673101Z"}],"nvd":[{"id":"CVE-2023-4236","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T13:15:12.313Z","modified":"2026-06-17T06:37:22.81Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:08:29.595868Z"}],"osv":[{"id":"ALPINE-CVE-2023-4236","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T13:15:12.313Z","modified":"2026-10-26T17:17:58.639664673Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:49.709457Z"},{"id":"BELL-CVE-2023-4236","status":"published","published":"2023-09-20T13:15:00Z","modified":"2026-01-26T09:35:28.909356Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:17.742221Z"},{"id":"CVE-2023-4236","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load.\nThis issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T13:15:12.313Z","modified":"2026-10-24T10:30:20.706679644Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:33.792101Z"},{"id":"DEBIAN-CVE-2023-4236","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T13:15:12.313Z","modified":"2026-10-26T18:02:32.750128431Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:40.275853Z"},{"id":"UBUNTU-CVE-2023-4236","description":"A flaw in the networking code handling DNS-over-TLS queries may cause `named` to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.","status":"published","published":"2023-09-20T00:00:00Z","modified":"2026-04-22T14:13:15.116713Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:54:22.741943Z"},{"id":"MGASA-2023-0303","title":"Updated bind packages fix security vulnerabilities","description":"The code that processes control channel messages sent to `named` calls\ncertain functions recursively during packet parsing. Recursion depth is\nonly limited by the maximum accepted packet size; depending on the\nenvironment, this may cause the packet-parsing code to run out of\navailable stack memory, causing `named` to terminate unexpectedly. Since\neach incoming control channel message is fully parsed before its\ncontents are authenticated, exploiting this flaw does not require the\nattacker to hold a valid RNDC key; only network access to the control\nchannel's configured TCP port is necessary. (CVE-2023-3341)\n\nA flaw in the networking code handling DNS-over-TLS queries may cause\n`named` to terminate unexpectedly due to an assertion failure. This\nhappens when internal data structures are incorrectly reused under\nsignificant DNS-over-TLS query load. (CVE-2023-4236)\n","status":"published","published":"2023-10-27T21:49:40Z","modified":"2026-04-16T04:42:09.996962204Z","updated_at":"2026-11-02T15:49:42.684501Z"},{"id":"openSUSE-SU-2024:13249-1","title":"bind-9.18.19-1.1 on GA media","description":"These are all security issues fixed in the bind-9.18.19-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:02:52.307544Z","updated_at":"2026-11-02T16:58:36.025801Z"},{"id":"USN-6390-1","title":"bind9 vulnerabilities","description":"It was discovered that Bind incorrectly handled certain control channel\nmessages. A remote attacker with access to the control channel could\npossibly use this issue to cause Bind to crash, resulting in a denial of\nservice. (CVE-2023-3341)\n\nRobert Story discovered that Bind incorrectly handled certain DNS-over-TLS\nqueries. A remote attacker could possibly use this issue to cause Bind to\ncrash, resulting in a denial of service. This issue only affected Ubuntu\n22.04 LTS, and Ubuntu 23.04. (CVE-2023-4236)\n","status":"published","published":"2023-09-20T14:07:21Z","modified":"2026-04-22T10:39:27.1322Z","updated_at":"2026-11-02T16:58:17.305935Z"}]}}