CVEvulnerability

CVE-2019-19331

7.5 HIGH Published 2019-12-16 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2019-12-16
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0 ([email protected])
7.5 HIGH — CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Weaknesses
CWE-404, CWE-407

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).

Affected configurations

• nic knot resolver (< 4.3.0) • debian debian linux 10.0

Related

Weakness · CWE (2)

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

References