{"id":"CVE-2018-5740","aliases":["ALPINE-CVE-2018-5740","BELL-CVE-2018-5740","DEBIAN-CVE-2018-5740","DLA-1485-1","DLA-2807-1","EUVD-2018-17509","GHSA-rqpc-6vjv-w22p","MGASA-2018-0353","RHSA-2018:2570","RHSA-2018:2571","SUSE-SU-2019:1407-1","SUSE-SU-2019:14074-1","SUSE-SU-2019:1449-1","SUSE-SU-2019:2502-1","UBUNTU-CVE-2018-5740","USN-3769-1","openSUSE-SU-2019:1533-1"],"status":"published","title":"A flaw in the \"deny-answer-aliases\" feature can cause an assertion failure in named","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","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":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.60236,"percentile":0.99145,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-617"],"published":"2018-08-09T00:00:00Z","modified":"2026-10-24T10:30:22Z","exploits":[{"source":"pocgithub","id":"sischkg/cve-2018-5740","title":"sischkg/cve-2018-5740","date":"2018-08-15","url":"https://github.com/sischkg/cve-2018-5740"}],"fixes":[{"ecosystem":"Alpine:v3.10","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.11","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.5","package":"bind","fixed_in":["9.10.8_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.6","package":"bind","fixed_in":["9.11.4_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.7","package":"bind","fixed_in":["9.11.4_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.8","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.9","package":"bind","fixed_in":["9.12.2_p1-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"bind9","fixed_in":["1:9.11.4.P1+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"bind9","fixed_in":["1:9.11.4.P1+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"bind9","fixed_in":["1:9.11.4.P1+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"bind9","fixed_in":["1:9.9.5.dfsg-9+deb8u16"],"sources":["osv"]},{"ecosystem":"Mageia:6","package":"bind","fixed_in":["9.10.8.P1-1.mga6"],"sources":["osv"]},{"ecosystem":"Red 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flaw in the \"deny-answer-aliases\" feature can cause an assertion failure in named","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2019-01-16T20:00:00Z","modified":"2024-09-16T17:58:43.029Z","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":"cna"}],"updated_at":"2026-11-02T14:35:00.948726Z"}],"euvd":[{"id":"EUVD-2018-17509","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2019-01-16T20:00:00Z","modified":"2024-09-16T17:58:43Z","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":"2026-11-03T00:55:36.806318Z"}],"ghsa":[{"id":"GHSA-rqpc-6vjv-w22p","title":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators...","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2022-05-13T01:02:33Z","modified":"2023-02-01T05:02:31Z","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":"2026-11-02T14:49:56.179573Z"}],"nvd":[{"id":"CVE-2018-5740","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2019-01-16T20:29:01.017Z","modified":"2026-06-17T02:00:41.717Z","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":"primary"},{"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":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:04:53.079938Z"}],"osv":[{"id":"ALPINE-CVE-2018-5740","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2019-01-16T20:29:01.017Z","modified":"2026-10-23T17:17:55.279338638Z","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":"2026-11-02T15:27:47.663013Z"},{"id":"BELL-CVE-2018-5740","title":"CVE-2018-5740 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:16:07.394428Z","modified":"2026-01-26T09:46:00.359386Z","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":"2026-11-02T15:28:14.701973Z"},{"id":"CVE-2018-5740","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2019-01-16T20:29:01.017Z","modified":"2026-10-24T10:30:22.437128959Z","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":"2026-11-02T15:44:09.442568Z"},{"id":"DEBIAN-CVE-2018-5740","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2019-01-16T20:29:01.017Z","modified":"2026-10-23T18:03:58.445264717Z","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":"2026-11-02T15:45:30.867575Z"},{"id":"RHSA-2018:2570","title":"Red Hat Security Advisory: bind security update","status":"published","published":"2024-09-16T01:41:47Z","modified":"2026-07-01T10:04:21Z","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":"2026-11-02T15:53:05.383061Z"},{"id":"RHSA-2018:2571","title":"Red Hat Security Advisory: bind security update","status":"published","published":"2024-09-16T01:41:55Z","modified":"2026-07-01T10:04:21Z","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":"2026-11-02T15:53:05.383061Z"},{"id":"UBUNTU-CVE-2018-5740","description":"\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.","status":"published","published":"2018-08-09T00:00:00Z","modified":"2026-04-22T11:59:11.271349Z","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"},{"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"},{"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":"2026-11-02T15:54:18.33562Z"},{"id":"DLA-1485-1","title":"bind9 - security update","status":"published","published":"2018-08-30T00:00:00Z","modified":"2026-03-09T01:01:27.977727Z","updated_at":"2026-11-02T15:46:09.777694Z"},{"id":"DLA-2807-1","title":"bind9 - security update","status":"published","published":"2021-11-01T00:00:00Z","modified":"2026-03-09T01:23:35.993494Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"id":"MGASA-2018-0353","title":"Updated bind packages fix security vulnerability","description":"Updated bind packages fix security vulnerability:\n\nIn ISC BIND, a defect in thie \"deny-answer-aliases\" feature makes it easy,\nwhen the feature is in use, to experience an assertion failure in name.c.\nAccidental or deliberate triggering of this defect will cause a REQUIRE\nassertion failure in named, causing the named process to stop execution\nand resulting in denial of service to clients (CVE-2018-5740).\n\nNote that only servers which have explicitly enabled the\n\"deny-answer-aliases\" feature are at risk and disabling the feature\nprevents exploitation.\n","status":"published","published":"2018-08-23T23:35:07Z","modified":"2026-04-16T06:25:29.844373115Z","updated_at":"2026-11-02T15:49:40.793816Z"},{"id":"openSUSE-SU-2019:1533-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-6465: Fixed an issue where controls for zone transfers may not be properly applied to Dynamically Loadable Zones (bsc#1126069).\n- CVE-2018-5745: Fixed a denial of service vulnerability if a trust anchor rolls over to an unsupported key algorithm when using managed-keys (bsc#1126068).\n- CVE-2018-5743: Fixed a denial of service vulnerability which could be caused by to many simultaneous TCP connections (bsc#1133185).\n- CVE-2018-5740: Fixed a denial of service vulnerability in the 'deny-answer-aliases' feature (bsc#1104129).\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2019-06-10T09:32:04Z","modified":"2026-02-04T03:56:00.63409Z","updated_at":"2026-11-02T16:58:30.784344Z"},{"id":"SUSE-SU-2019:1407-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-6465: Fixed an issue where controls for zone transfers may not be properly applied to Dynamically Loadable Zones (bsc#1126069).\n- CVE-2018-5745: Fixed a denial of service vulnerability if a trust anchor rolls over to an unsupported key algorithm when using managed-keys (bsc#1126068).\n- CVE-2018-5743: Fixed a denial of service vulnerability which could be caused by to many simultaneous TCP connections (bsc#1133185).\n- CVE-2018-5740: Fixed a denial of service vulnerability in the 'deny-answer-aliases' feature (bsc#1104129).\n","status":"published","published":"2019-06-03T11:34:09Z","modified":"2026-02-04T04:00:59.951363Z","updated_at":"2026-11-02T15:53:46.44301Z"},{"id":"SUSE-SU-2019:14074-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-5740: Fixed a denial of service vulnerability in the 'deny-answer-aliases' feature (bsc#1104129).\n- CVE-2018-5743: Limiting simultaneous TCP clients is ineffective. (bsc#1133185)\n- CVE-2018-5745: An assertion failure can occur if a trust anchor rolls over to an unsupported key algorithm when using managed-keys. (bsc#1126068)\n- CVE-2019-6465: Fixed an issue where controls for zone transfers may not be properly applied to Dynamically Loadable Zones (bsc#1126069).\n","status":"published","published":"2019-06-06T16:25:43Z","modified":"2026-02-04T04:25:05.266568Z","updated_at":"2026-11-02T15:53:46.44301Z"},{"id":"SUSE-SU-2019:1449-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2018-5740: Fixed a denial of service vulnerability in the 'deny-answer-aliases' feature (bsc#1104129).\n- CVE-2019-6465: Fixed an issue where controls for zone transfers may not be properly applied to Dynamically Loadable Zones (bsc#1126069).\n- CVE-2018-5745: An assertion failure can occur if a trust anchor rolls over to an unsupported key algorithm when using managed-keys. (bsc#1126068)\n- CVE-2018-5743: Limiting simultaneous TCP clients is ineffective. (bsc#1133185)\n\n","status":"published","published":"2019-06-07T11:00:10Z","modified":"2026-02-04T03:21:17.052784Z","updated_at":"2026-11-02T15:53:46.44301Z"},{"id":"SUSE-SU-2019:2502-1","title":"Security update for bind","description":"This update for bind fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2019-6465: Fixed an issue where controls for zone transfers may not be properly applied to Dynamically Loadable Zones (bsc#1126069).\n- CVE-2019-6471: Fixed a reachable assert in dispatch.c. (bsc#1138687)\n- CVE-2018-5745: Fixed a denial of service vulnerability if a trust anchor rolls over to an unsupported key algorithm when using managed-keys (bsc#1126068).\n- CVE-2018-5743: Fixed a denial of service vulnerability which could be caused by to many simultaneous TCP connections (bsc#1133185).\n- CVE-2018-5740: Fixed a denial of service vulnerability in the 'deny-answer-aliases' feature (bsc#1104129).\n\nNon-security issues fixed:\n\n- Don't rely on /etc/insserv.conf anymore for proper dependencies against \n  nss-lookup.target in named.service and lwresd.service (bsc#1118367, bsc#1118368).\n- Fix FIPS related regression (bsc#1128220).\n","status":"published","published":"2019-10-01T11:06:19Z","modified":"2026-02-04T03:07:35.67838Z","updated_at":"2026-11-02T15:53:46.44301Z"},{"id":"USN-3769-1","title":"bind9 vulnerability","description":"It was discovered that Bind incorrectly handled the deny-answer-aliases\nfeature. If this feature is enabled, a remote attacker could use this issue\nto cause Bind to crash, resulting in a denial of service.\n","status":"published","published":"2018-09-20T07:34:15Z","modified":"2026-04-22T09:49:28.114444Z","updated_at":"2026-11-02T16:58:14.019824Z"}]}}