{"id":"CVE-2024-43168","aliases":["AZL-47774","AZL-47776","CLSA-2026-1785318558","CLSA-2026-1785417704","CLSA-2026-1785489388","DEBIAN-CVE-2024-43168","DLA-3903-1","EUVD-2024-40094","GHSA-3jwc-8hp9-37fw","OESA-2024-2025","UBUNTU-CVE-2024-43168","USN-6998-1"],"status":"published","title":"Unbound: heap-buffer-overflow in unbound","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00314,"percentile":0.2466,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-122"],"published":"2024-08-08T20:25:24Z","modified":"2026-11-02T12:02:45Z","fixes":[{"ecosystem":"Azure Linux:3","package":"unbound","fixed_in":["1.19.1-2"],"sources":["osv"]},{"ecosystem":"Azure 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Linux:3","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.1-2"}]}]},{"source":"osv","ecosystem":"Azure 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nges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.7-1ubuntu2.6+esm2"}]}],"versions":["1.6.5-1","1.6.7-1","1.6.7-1build1","1.6.7-1ubuntu1","1.6.7-1ubuntu2","1.6.7-1ubuntu2.1","1.6.7-1ubuntu2.2","1.6.7-1ubuntu2.3","1.6.7-1ubuntu2.4","1.6.7-1ubuntu2.5","1.6.7-1ubuntu2.6"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.4-2ubuntu1.8"}]}],"versions":["1.9.0-2ubuntu1","1.9.0-2ubuntu2","1.9.4-2","1.9.4-2ubuntu1","1.9.4-2ubuntu1.1","1.9.4-2ubuntu1.2","1.9.4-2ubuntu1.3","1.9.4-2ubuntu1.4","1.9.4-2ubuntu1.5","1.9.4-2ubuntu1.6"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.1-1ubuntu5.7"}]}],"versions":["1.13.1-1ubuntu1","1.13.1-1ubuntu3","1.13.1-1ubuntu5","1.13.1-1ubuntu5.1","1.13.1-1ubuntu5.2","1.13.1-1ubuntu5.3","1.13.1-1ubuntu5.4","1.13.1-1ubuntu5.5"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.2-1ubuntu3.2"}]}],"versions":["1.17.1-2","1.18.0-2ubuntu1","1.18.0-2ubuntu2","1.19.1-1ubuntu1","1.19.2-1ubuntu1","1.19.2-1ubuntu3","1.19.2-1ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.22-1ubuntu4.14.04.3+esm1"}]}],"versions":["1.4.20-1","1.4.21-1","1.4.21-1ubuntu1","1.4.21-1ubuntu2","1.4.22-1ubuntu1","1.4.22-1ubuntu2","1.4.22-1ubuntu3","1.4.22-1ubuntu4","1.4.22-1ubuntu4.14.04.1","1.4.22-1ubuntu4.14.04.2","1.4.22-1ubuntu4.14.04.3"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.8-1ubuntu1.1+esm1"}]}],"versions":["1.4.22-1ubuntu6","1.5.7-1ubuntu1","1.5.7-1ubuntu2","1.5.8-1ubuntu1","1.5.8-1ubuntu1.1"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.7-1ubuntu2.6+esm2"}]}],"versions":["1.6.5-1","1.6.7-1","1.6.7-1build1","1.6.7-1ubuntu1","1.6.7-1ubuntu2","1.6.7-1ubuntu2.1","1.6.7-1ubuntu2.2","1.6.7-1ubuntu2.3","1.6.7-1ubuntu2.4","1.6.7-1ubuntu2.5","1.6.7-1ubuntu2.6"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.4-2ubuntu1.8"}]}],"versions":["1.9.0-2ubuntu1","1.9.0-2ubuntu2","1.9.4-2","1.9.4-2ubuntu1","1.9.4-2ubuntu1.1","1.9.4-2ubuntu1.2","1.9.4-2ubuntu1.3","1.9.4-2ubuntu1.4","1.9.4-2ubuntu1.5","1.9.4-2ubuntu1.6"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.1-1ubuntu5.7"}]}],"versions":["1.13.1-1ubuntu1","1.13.1-1ubuntu3","1.13.1-1ubuntu5","1.13.1-1ubuntu5.1","1.13.1-1ubuntu5.2","1.13.1-1ubuntu5.3","1.13.1-1ubuntu5.4","1.13.1-1ubuntu5.5"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"unbound","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.2-1ubuntu3.2"}]}],"versions":["1.17.1-2","1.18.0-2ubuntu1","1.18.0-2ubuntu2","1.19.1-1ubuntu1","1.19.2-1ubuntu1","1.19.2-1ubuntu3","1.19.2-1ubuntu3.1"],"bundled":2}],"products":[{"vendor":"red hat","product":"red hat enterprise linux 6"},{"vendor":"red hat","product":"red hat enterprise linux 7"},{"vendor":"red hat","product":"red hat enterprise linux 8"},{"vendor":"red hat","product":"red hat enterprise linux 9"},{"vendor":"red hat","product":"red hat openshift container platform 4"},{"vendor":"red hat","product":"red hat openstack platform 16.2"},{"vendor":"red hat","product":"red hat openstack platform 17.1"},{"vendor":"red hat","product":"red hat openstack platform 18.0"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2024-43168","tags":["vdb-entry","x_refsource_REDHAT","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2303462","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://github.com/NLnetLabs/unbound/issues/1039","tags":["report"]},{"url":"https://github.com/NLnetLabs/unbound/pull/1040/files","tags":["web"]},{"url":"https://lists.debian.org/debian-lts-announce/2024/09/msg00046.html","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-43168","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-3jwc-8hp9-37fw"},{"url":"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1785318558.html","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42923","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1785417704.html","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50243","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/centos-stream8els/CLSA-2026-1785489388.html","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2024-43168","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-2025","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-43167","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2024-43168","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2024-43168","tags":["report"]},{"url":"https://github.com/NLnetLabs/unbound/pull/1040","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-6998-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2024-43167","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2024-43168","title":"Unbound: heap-buffer-overflow in unbound","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-08T20:25:24.723Z","modified":"2025-11-03T22:04:59.198Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:33:58.357949Z"}],"euvd":[{"id":"EUVD-2024-40094","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-08T20:25:24Z","modified":"2025-11-03T22:04:59Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T19:49:29.890052Z"}],"ghsa":[{"id":"GHSA-3jwc-8hp9-37fw","title":"A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file...","description":"A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-12T15:30:51Z","modified":"2025-11-04T00:31:12Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:04:27.294317Z"}],"nvd":[{"id":"CVE-2024-43168","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-12T13:38:36.187Z","modified":"2026-06-17T07:50:33.66Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:10:18.563492Z"}],"osv":[{"id":"CVE-2024-43168","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-12T13:38:36.187Z","modified":"2026-03-15T22:49:37.39408Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:42.322107Z"},{"id":"DEBIAN-CVE-2024-43168","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-12T13:38:36.187Z","modified":"2026-11-02T12:02:45.087151989Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:43.156294Z"},{"id":"OESA-2024-2025","title":"unbound security update","description":"Unbound is a validating, recursive, caching DNS resolver. It is designed to be fast and lean and incorporates modern features based on open standards. To help increase online privacy, Unbound supports DNS-over-TLS which allows clients to encrypt their communication. Unbound is available for most platforms such as FreeBSD, OpenBSD, NetBSD, MacOS, Linux and Microsoft Windows. Unbound is a totally free, open source software under the BSD license. It doesn\u0026apos;t make custom builds or provide specific features to paying customers only.\n\nSecurity Fix(es):\n\nA NULL pointer dereference flaw was found in the ub_ctx_set_fwd function in Unbound. This issue could allow an attacker who can invoke specific sequences of API calls to cause a segmentation fault. When certain API functions such as ub_ctx_set_fwd and ub_ctx_resolvconf are called in a particular order, the program attempts to read from a NULL pointer, leading to a crash. This issue can result in a denial of service by causing the application to terminate unexpectedly.(CVE-2024-43167)\n\nA heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound\u0026apos;s config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.(CVE-2024-43168)","status":"published","published":"2024-08-23T11:07:29Z","modified":"2026-08-18T01:18:34.824572927Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:41.595342Z"},{"id":"UBUNTU-CVE-2024-43168","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-12T13:38:00Z","modified":"2026-04-22T15:04:37.480283Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T16:54:58.679387Z"},{"id":"AZL-47774","title":"CVE-2024-43168 affecting package unbound for versions less than 1.19.1-2","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-12T13:38:36Z","modified":"2026-06-02T05:26:23Z","updated_at":"2026-11-02T15:28:05.694722Z"},{"id":"AZL-47776","title":"CVE-2024-43168 affecting package unbound for versions less than 1.19.1-2","description":"DISPUTE NOTE: this issue does not pose a security risk as it (according to analysis by the original software developer, NLnet Labs) falls within the expected functionality and security controls of the application. Red Hat has made a claim that there is a security risk within Red Hat products. NLnet Labs has no further information about the claim, and suggests that affected Red Hat customers refer to available Red Hat documentation or support channels. ORIGINAL DESCRIPTION: A heap-buffer-overflow flaw was found in the cfg_mark_ports function within Unbound's config_file.c, which can lead to memory corruption. This issue could allow an attacker with local access to provide specially crafted input, potentially causing the application to crash or allowing arbitrary code execution. This could result in a denial of service or unauthorized actions on the system.","status":"published","published":"2024-08-12T13:38:36Z","modified":"2026-04-21T04:31:39.563536Z","updated_at":"2026-11-02T15:28:05.694722Z"},{"id":"CLSA-2026-1785318558","title":"unbound: Fix of 2 CVEs","description":"- CVE-2026-42923: cap NSEC3 hash calculations in the negative-cache DS proof\n  and reject oversized NSEC3 salt\n- CVE-2024-43168: reject negative port numbers in outgoing-port-permit/avoid\n  to prevent an out-of-bounds write","status":"published","published":"2026-07-29T09:49:30Z","modified":"2026-10-26T09:43:22.561885133Z","updated_at":"2026-11-02T15:43:46.482572Z"},{"id":"CLSA-2026-1785417704","title":"unbound: Fix of 3 CVEs","description":"- CVE-2026-50243: do not let response-ip/rpz rewrite a BOGUS answer; return SERVFAIL\n- CVE-2026-42923: cap NSEC3 hash calculations in the negative-cache DS proof\n  and reject oversized NSEC3 salt\n- CVE-2024-43168: reject negative port numbers in outgoing-port-permit/avoid\n  to prevent an out-of-bounds write","status":"published","published":"2026-07-30T13:21:57Z","modified":"2026-10-26T09:43:53.510600847Z","updated_at":"2026-11-02T15:43:46.850893Z"},{"id":"CLSA-2026-1785489388","title":"unbound: Fix of 3 CVEs","description":"- CVE-2026-50243: do not let response-ip/rpz rewrite a BOGUS answer; return SERVFAIL\n- CVE-2026-42923: cap NSEC3 hash calculations in the negative-cache DS proof\n  and reject oversized NSEC3 salt\n- CVE-2024-43168: reject negative port numbers in outgoing-port-permit/avoid\n  to prevent an out-of-bounds write","status":"published","published":"2026-07-31T09:16:43Z","modified":"2026-10-26T09:43:57.925582416Z","updated_at":"2026-11-02T15:43:46.850893Z"},{"id":"DLA-3903-1","title":"unbound - security update","status":"published","published":"2024-09-29T00:00:00Z","modified":"2026-03-09T01:22:31.047587Z","updated_at":"2026-11-02T15:46:12.203458Z"},{"id":"USN-6998-1","title":"unbound vulnerabilities","description":"It was discovered that Unbound incorrectly handled string comparisons,\nwhich could lead to a NULL pointer dereference. An attacker could \npotentially use this issue to cause a denial of service. (CVE-2024-43167)\n\nIt was discovered that Unbound incorrectly handled memory in \ncfg_mark_ports, which could lead to a heap buffer overflow. A local \nattacker could potentially use this issue to cause a denial of service\nor execute arbitrary code. (CVE-2024-43168)\n","status":"published","published":"2024-09-11T01:33:35Z","modified":"2026-06-29T13:51:16.04763124Z","updated_at":"2026-11-02T16:58:18.876384Z"}]}}