CVE-2022-40188

HIGH
Published Sep 23, 20223y ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Sep 23, 2022 3y ago
Last Modified Jun 17, 2026 1w ago

Description

Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of algorithmic complexity. During an attack, an authoritative server must return large NS sets or address sets.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-407

Affected Products 5

VendorProductVersionRange
nicknot_resolver* <5.5.3
fedoraprojectfedora35any
fedoraprojectfedora36any
fedoraprojectfedora37any
debiandebian_linux10.0any

References 5

  • gitlab.nic.cz https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1343#note_262558
    Release NotesThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2022/10/msg00008.html
    Mailing ListThird Party Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HIMDNIUI7GTUEKIBBYYW7OCTJQFPDNXL/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S2VE5K3VDUHJOIA2IGT3G5R76IBADMNE/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XO6LIVQS62MI5GG4OVYB5RHVZMYNHAHG/

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.