{"cve":"CVE-2019-19331","nvd":{"published":"2019-12-16T16:15:11.660","modified":"2026-06-17T02:26:30.960","status":"Modified","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).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-404","CWE-407"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19331","https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html","https://www.knot-resolver.cz/2019-12-04-knot-resolver-4.3.0.html","https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19331","https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html"],"products":["debian:debian_linux","nic:knot_resolver"],"source":"nvd","synced_at":"2026-10-19T20:59:27.069234358+00:00"},"epss":{"cve":"CVE-2019-19331","score":0.02107,"percentile":0.81759,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}