{"id":"CVE-2025-30193","aliases":["ALPINE-CVE-2025-30193","DEBIAN-CVE-2025-30193","EUVD-2025-15818","GHSA-4q3h-v92p-gchj","SUSE-SU-2025:01743-1","SUSE-SU-2025:01745-1","SUSE-SU-2025:01792-1","UBUNTU-CVE-2025-30193","USN-8037-1"],"status":"published","title":"Denial of service via crafted TCP exchange","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.\n\nThe remedy is: upgrade to the patched 1.9.10 version.\n\nA workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.\n\nWe would like to thank Renaud Allard for bringing this issue to our attention.","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":"2026-11-12","score":0.00618,"percentile":0.50114,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674"],"published":"2025-05-20T11:17:17Z","modified":"2026-11-03T06:33:00Z","fixes":[{"ecosystem":"Alpine:v3.21","package":"dnsdist","fixed_in":["1.9.10-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"dnsdist","fixed_in":["1.9.10-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"dnsdist","fixed_in":["1.9.10-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"dnsdist","fixed_in":["1.9.10-r0"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"dnsdist","fixed_in":["1.9.10-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"dnsdist","fixed_in":["1.9.10-1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux 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7.1","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.0-150100.3.8.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-1ubuntu0.1~esm2"}]}],"versions":["1.5.1-3build2","1.6.1-1build1","1.6.1-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.3-2ubuntu0.1~esm1"}]}],"versions":["1.8.0-1","1.8.2-1","1.8.2-2","1.8.2-3","1.8.3-1","1.8.3-2","1.8.3-2build1","1.8.3-2build2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-1ubuntu0.1~esm2"}]}],"versions":["1.5.1-3build2","1.6.1-1build1","1.6.1-1ubuntu0.1~esm1"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.3-2ubuntu0.1~esm1"}]}],"versions":["1.8.0-1","1.8.2-1","1.8.2-2","1.8.2-3","1.8.3-1","1.8.3-2","1.8.3-2build1","1.8.3-2build2"],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.10-1ubuntu0.1"}]}],"versions":["1.9.8-1","1.9.10-1"],"bundled":3}],"products":[{"vendor":"powerdns","product":"dnsdist"}],"references":[{"url":"https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html","tags":["advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-30193","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-4q3h-v92p-gchj"},{"url":"https://security.alpinelinux.org/vuln/CVE-2025-30193","tags":["advisory"]},{"url":"https://repo.powerdns.com/","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/30xxx/CVE-2025-30193.json","tags":["advisory"]},{"url":"https://github.com/PowerDNS/pdns","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-30193","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2025/suse-su-202501743-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1242028","tags":["report"]},{"url":"https://bugzilla.suse.com/1243378","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2025-30193","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-30194","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2025/suse-su-202501745-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2025/suse-su-202501792-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-30193","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-30193","tags":["report"]},{"url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html","tags":["report"]},{"url":"https://github.com/PowerDNS/pdns/pull/15572","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8037-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-8671","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2025-30187","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-30193","title":"Denial of service via crafted TCP exchange","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.\n\nThe remedy is: upgrade to the patched 1.9.10 version.\n\nA workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.\n\nWe would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T11:17:17.378Z","modified":"2025-05-20T13:16:34.707Z","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"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:32:35.099955Z"}],"euvd":[{"id":"EUVD-2025-15818","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.\n\nThe remedy is: upgrade to the patched 1.9.10 version.\n\nA workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.\n\nWe would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T11:17:17Z","modified":"2025-05-20T13:16:34Z","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":"2026-11-02T20:32:43.763029Z"}],"ghsa":[{"id":"GHSA-4q3h-v92p-gchj","title":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a...","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.\n\nThe remedy is: upgrade to the patched 1.9.10 version.\n\nA workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.\n\nWe would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T12:30:23Z","modified":"2025-05-20T12:30:32Z","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-674"],"updated_at":"2026-11-02T15:02:21.932853Z"}],"nvd":[{"id":"CVE-2025-30193","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.\n\nThe remedy is: upgrade to the patched 1.9.10 version.\n\nA workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.\n\nWe would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T12:15:19.697Z","modified":"2026-06-17T09:08:19.67Z","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-674"],"updated_at":"2026-11-02T14:11:09.125937Z"}],"osv":[{"id":"ALPINE-CVE-2025-30193","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.\n\nThe remedy is: upgrade to the patched 1.9.10 version.\n\nA workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.\n\nWe would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T12:15:19.697Z","modified":"2026-11-03T06:33:00.396236721Z","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":"2026-11-03T07:16:09.603409Z"},{"id":"CVE-2025-30193","title":"Denial of service via crafted TCP exchange","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.\n\nThe remedy is: upgrade to the patched 1.9.10 version.\n\nA workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.\n\nWe would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T11:17:17.378Z","modified":"2026-10-28T02:31:03.863028949Z","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-674"],"updated_at":"2026-11-02T15:44:47.708311Z"},{"id":"DEBIAN-CVE-2025-30193","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.  The remedy is: upgrade to the patched 1.9.10 version.  A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.  We would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T12:15:19.697Z","modified":"2026-09-01T20:05:45.565397161Z","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":"2026-11-02T15:45:45.870237Z"},{"id":"UBUNTU-CVE-2025-30193","description":"In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.10 version. A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting. We would like to thank Renaud Allard for bringing this issue to our attention.","status":"published","published":"2025-05-20T12:15:00Z","modified":"2026-02-13T18:28:49.6446Z","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":"2026-11-02T16:55:26.330196Z"},{"id":"SUSE-SU-2025:01743-1","title":"Security update for dnsdist","description":"This update for dnsdist fixes the following issues:\n\nUpdate to version 1.9.10.\n  \n- CVE-2025-30194: illegal memory access (double-free) when processing specially crafted DoH exchanges leads to a\n  denial-of-service (bsc#1242028).\n- CVE-2025-30193: stack exhaustion when processing too many queries on incoming TCP connections leads to a\n  denial-of-service (bsc#1243378).\n","status":"published","published":"2025-05-29T11:44:30Z","modified":"2026-02-04T03:25:21.843911Z","updated_at":"2026-11-02T15:53:56.123059Z"},{"id":"SUSE-SU-2025:01745-1","title":"Security update for dnsdist","description":"This update for dnsdist fixes the following issues:\n\n- CVE-2025-30193: stack exhaustion when processing too many queries on incoming TCP connections leads to a\n  denial-of-service (bsc#1243378).\n","status":"published","published":"2025-05-29T12:21:01Z","modified":"2026-02-04T04:14:36.909702Z","updated_at":"2026-11-02T15:53:56.123059Z"},{"id":"SUSE-SU-2025:01792-1","title":"Security update for dnsdist","description":"This update for dnsdist fixes the following issues:\n\n- CVE-2025-30193: stack exhaustion when processing too many queries on incoming TCP connections leads to a\n  denial-of-service (bsc#1243378).\n","status":"published","published":"2025-06-02T07:38:53Z","modified":"2026-02-04T04:12:17.462855Z","updated_at":"2026-11-02T15:53:56.123059Z"},{"id":"USN-8037-1","title":"dnsdist vulnerabilities","description":"It was discovered that HTTP/2, which is used/vendored by DNSdist, did not\nproperly account for resources when handling client-triggered stream \nresets. An attacker could possibly use this issue to cause a \ndenial of service. (CVE-2025-8671)\n\nIt was discovered that DNSdist did not properly manage memory limits when\nhandling an unlimited number of queries on a single TCP connection. An \nattacker could possibly use this issue to cause a denial of service.\n(CVE-2025-30193)\n\nIt was discovered that DNSdist, when configured with the nghttp2 library,\ndid not correctly process certain DNS over HTTPS queries. An attacker\ncould possibly use this cause a denial of service. (CVE-2025-30187)","status":"published","published":"2026-02-12T15:41:01Z","modified":"2026-04-27T18:33:15.574144709Z","updated_at":"2026-11-02T16:58:22.951676Z"}]}}