{"id":"CVE-2025-30187","aliases":["ALPINE-CVE-2025-30187","DEBIAN-CVE-2025-30187","EUVD-2025-30004","GHSA-2qmc-ch65-q9cm","SUSE-SU-2026:0888-1","SUSE-SU-2026:20995-1","UBUNTU-CVE-2025-30187","USN-8037-1","openSUSE-SU-2026:20461-1"],"status":"published","title":"Denial of service via crafted DoH exchange in PowerDNS DNSdist","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","severity":{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00302,"percentile":0.23207,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-835"],"published":"2025-09-18T09:21:32Z","modified":"2026-11-03T06:32:14Z","fixes":[{"ecosystem":"Alpine:v3.23","package":"dnsdist","fixed_in":["2.0.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"dnsdist","fixed_in":["2.0.1-r0"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"dnsdist","fixed_in":["1.9.10-1+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"dnsdist","fixed_in":["2.0.1-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:25.10","package":"dnsdist","fixed_in":["1.9.10-1ubuntu0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.23","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.1-r0"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.10-1+deb13u1"}]}],"versions":["1.9.10-1"]},{"source":"osv","ecosystem":"Debian:14","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.1-1"}]}],"versions":["1.9.10-1","2.0.0-1","2.0.0-2","2.0.0-3","2.0.0-4","2.0.0-5","2.0.0-6","2.0.0~rc1-1","2.0.0~rc1-2","2.0.0~rc2-1"]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP7","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.11-150700.3.6.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 16.0","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.11-160000.1.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.11-160000.1.1"}]}],"bundled":2},{"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"]},{"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},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"dnsdist","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.11-160000.1.1"}]}],"bundled":2}],"products":[{"vendor":"powerdns","product":"dnsdist"}],"references":[{"url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-05.html","tags":["advisory","report"]},{"url":"http://www.openwall.com/lists/oss-security/2025/09/18/1","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-30187","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-2qmc-ch65-q9cm"},{"url":"https://security.alpinelinux.org/vuln/CVE-2025-30187","tags":["advisory"]},{"url":"https://repo.powerdns.com/","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/30xxx/CVE-2025-30187.json","tags":["advisory"]},{"url":"https://github.com/PowerDNS/pdns","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-30187","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20260888-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1243566","tags":["report"]},{"url":"https://bugzilla.suse.com/1250054","tags":["report"]},{"url":"https://bugzilla.suse.com/1253852","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2025-30187","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-8671","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202620995-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-30187","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-30187","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2025/09/18/1","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-2025-30193","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-30187","title":"Denial of service via crafted DoH exchange in PowerDNS DNSdist","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T09:21:32.274Z","modified":"2025-11-04T21:09:56.609Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"cna"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:32:35.418416Z"}],"euvd":[{"id":"EUVD-2025-30004","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T09:21:32Z","modified":"2025-11-04T21:09:56Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T19:49:21.645169Z"}],"ghsa":[{"id":"GHSA-2qmc-ch65-q9cm","title":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming...","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T12:30:26Z","modified":"2025-11-05T00:31:28Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T15:04:39.50413Z"}],"nvd":[{"id":"CVE-2025-30187","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T10:15:32.993Z","modified":"2026-06-17T09:08:19.067Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:11:30.865098Z"}],"osv":[{"id":"ALPINE-CVE-2025-30187","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T10:15:32.993Z","modified":"2026-11-03T06:32:14.466708641Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-03T07:18:15.355745Z"},{"id":"CVE-2025-30187","title":"Denial of service via crafted DoH exchange in PowerDNS DNSdist","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T09:21:32.274Z","modified":"2026-10-28T02:30:48.300446383Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T15:44:47.708311Z"},{"id":"DEBIAN-CVE-2025-30187","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T10:15:32.993Z","modified":"2026-09-01T20:05:45.550144673Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:45:45.870237Z"},{"id":"UBUNTU-CVE-2025-30187","description":"In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.","status":"published","published":"2025-09-18T10:15:00Z","modified":"2026-02-13T18:28:56.469328Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T16:55:26.330196Z"},{"id":"openSUSE-SU-2026:20461-1","title":"Security update for dnsdist","description":"This update for dnsdist fixes the following issues:\n\nUpdate to dnsdist 1.9.11:\n\n- CVE-2025-8671: add mitigations for the HTTP/2 MadeYouReset attack (bsc#1253852).\n- CVE-2025-30187: denial of service via crafted DoH exchange (bsc#1250054).\n","status":"published","published":"2026-04-02T09:11:51Z","modified":"2026-04-09T18:24:46.296709Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"SUSE-SU-2026:0888-1","title":"Security update for dnsdist","description":"This update for dnsdist fixes the following issues:\n\nUpdate to dnsdist 1.9.11:\n\n- CVE-2025-8671: Add mitigations for the HTTP/2 MadeYouReset attack (bsc#1253852).\n- CVE-2025-30187: denial of service via crafted DoH exchange (bsc#1250054).\n","status":"published","published":"2026-03-13T07:08:03Z","modified":"2026-03-14T08:16:00.15397Z","updated_at":"2026-11-02T15:54:01.262144Z"},{"id":"SUSE-SU-2026:20995-1","title":"Security update for dnsdist","description":"This update for dnsdist fixes the following issues:\n\nUpdate to dnsdist 1.9.11:\n\n- CVE-2025-8671: add mitigations for the HTTP/2 MadeYouReset attack (bsc#1253852).\n- CVE-2025-30187: denial of service via crafted DoH exchange (bsc#1250054).\n","status":"published","published":"2026-04-02T09:16:22Z","modified":"2026-04-10T18:33:45.681171Z","updated_at":"2026-11-02T15:54:01.953589Z"},{"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"}]}}