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).
Scores
CVSS v3
7.5
EPSS
0.0049
EPSS Percentile
65.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-407
CWE-404
Status
published
Products (2)
debian/debian_linux
10.0
nic/knot_resolver
< 4.3.0
Published
Dec 16, 2019
Tracked Since
Feb 18, 2026