VulnerabilityModified
CVE-2019-19331
knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization.
HIGH 7.5EPSS 2.17%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.17%). 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
- 2.17% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-407, CWE-404
- Affected
- nic/knot resolver · debian/debian linux
- Source
- secalert@redhat.com
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. Refreshed daily.