{"id":"CVE-2019-19331","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-19331","generatedAt":"2026-10-27T21:14:57.566Z","title":"knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization.","description":"knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with very many resource records might be processed very inefficiently, in extreme cases taking even several CPU seconds for each such uncached message. For example, a few thousand A records can be squashed into one DNS message (limit is 64kB).","published":"2019-12-16T16:15:12.000Z","lastModified":"2026-06-17T02:26:31.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-407","CWE-404"],"affected":["nic/knot resolver","debian/debian linux"],"epss":{"score":0.02107,"percentile":0.81631,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.11%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19331","tags":["Exploit","Issue Tracking","Patch"],"source":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html","source":"secalert@redhat.com"},{"url":"https://www.knot-resolver.cz/2019-12-04-knot-resolver-4.3.0.html","tags":["Release Notes","Vendor Advisory"],"source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19331","tags":["Exploit","Issue Tracking","Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.knot-resolver.cz/2019-12-04-knot-resolver-4.3.0.html","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-19331","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}