{"id":"UBUNTU-CVE-2025-30193","details":"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.","modified":"2026-02-13T18:28:49.644600Z","published":"2025-05-20T12:15:00Z","related":["USN-8037-1"],"upstream":["CVE-2025-30193"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-30193"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-30193"},{"type":"REPORT","url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html"},{"type":"REPORT","url":"https://github.com/PowerDNS/pdns/pull/15572"},{"type":"REPORT","url":"https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8037-1"}],"affected":[{"package":{"name":"dnsdist","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/dnsdist@1.6.1-1ubuntu0.1~esm2?arch=source&distro=esm-apps/jammy"},"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"],"ecosystem_specific":{"binaries":[{"binary_name":"dnsdist","binary_version":"1.6.1-1ubuntu0.1~esm2"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-30193.json"}},{"package":{"name":"dnsdist","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/dnsdist@1.8.3-2ubuntu0.1~esm1?arch=source&distro=esm-apps/noble"},"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"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"dnsdist","binary_version":"1.8.3-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-30193.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}