CVE-2019-19331

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).

• CWE-407
• CWE-404

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19331Exploit, Issue Tracking, Patch
• https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
• https://www.knot-resolver.cz/2019-12-04-knot-resolver-4.3.0.htmlRelease Notes, Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19331Exploit, Issue Tracking, Patch
• https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
• https://www.knot-resolver.cz/2019-12-04-knot-resolver-4.3.0.htmlRelease Notes, Vendor Advisory

Published

Dec 16, 2019

Last Modified

Jun 17, 2026

Status

Modified

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