CVE-2019-19331: Debian Linux
High severity, CVSS 7.5. EPSS: 2.1% chance of exploitation in the next 30 days.
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).
Affected products
Published 2019-12-16. Last modified 2026-06-17.