VULNERABILITY INTELLIGENCE

CVE-2019-19331

CVSS score7.5 HIGH
EPSS probability2.11%
CISA KEVNot currently listed
Published2019-12-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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).

Weakness classification

  • CWE-404: Improper Resource Shutdown or Release
  • CWE-407: Inefficient Algorithmic Complexity

Primary references