Home/CVE/knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with ver
CVE

CVE-2019-19331

knot-resolver before version 4.3.0 is vulnerable to denial of service through high CPU utilization. DNS replies with ver

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).

HIGH · CVSS 7.5 EPSS 0.00489
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

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

Affected Products & Versions

2
nic knot resolver< 4.3.0
debian linuxall versions
⚠

Public Exploits & PoCs

1
pocbugzilla.redhat.com · show_bug.cgi?id=CVE-2019-19331bugzilla.redhat.com
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD16 Dec 2019 · 04:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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 NotesVendor Advisory
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