CVE-2019-19331
knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.11%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.11% probability · 82th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-407, CWE-404
- Affected
- nic/knot resolver · debian/debian linux
- Source
- secalert@redhat.com
EPSS 2.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.