{"id":"CVE-2025-30193","state":"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.","publishedAt":"2025-05-20T11:17:17.378Z","updatedAt":"2025-05-20T13:16:34.707Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"OX"},"assigner":"OX","products":["PowerDNS DNSdist"],"affected":[{"vendor":"PowerDNS","product":"DNSdist","packageName":"dnsdist","defaultStatus":"affected","versions":[{"version":"1.9.10","status":"unaffected","versionType":"semver"}],"collectionURL":"https://repo.powerdns.com/","modules":["DNS over TCP"],"programFiles":["dnsdist-tcp.cc"],"repo":"https://github.com/PowerDNS/pdns"}],"references":["https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html"],"weaknesses":["CWE-674"],"ingestedAt":"2026-10-29T20:08:55.257Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/30xxx/CVE-2025-30193.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2025-30193","state":"PUBLISHED","datePublished":"2025-05-20T11:17:17.378Z","dateUpdated":"2025-05-20T13:16:34.707Z","assignerShortName":"OX","assignerOrgId":"8ce71d90-2354-404b-a86e-bec2cc4e6981","dateReserved":"2025-03-18T08:39:46.884Z"},"containers":{"cna":{"title":"Denial of service via crafted TCP exchange","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"PowerDNS","product":"DNSdist","packageName":"dnsdist","defaultStatus":"affected","versions":[{"version":"1.9.10","status":"unaffected","versionType":"semver"}],"collectionURL":"https://repo.powerdns.com/","modules":["DNS over TCP"],"programFiles":["dnsdist-tcp.cc"],"repo":"https://github.com/PowerDNS/pdns"}],"references":[{"url":"https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html"}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-674","description":"CWE-674 Uncontrolled Recursion","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"OX","orgId":"8ce71d90-2354-404b-a86e-bec2cc4e6981","dateUpdated":"2025-05-20T11:17:17.378Z"},"credits":[{"lang":"en","type":"finder","value":"Renaud Allard"}],"datePublic":"2025-05-20T11:00:00.000Z","source":{"advisory":"PowerDNS Security Advisory 2025-03","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2025-05-20T13:16:06.361581Z","id":"CVE-2025-30193","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-05-20T13:16:34.707Z"}}]}}}