Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2023-26249

Published: 21 February 2023

Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
knot-resolver
Launchpad, Ubuntu, Debian
bionic Needed

focal Needed

jammy Needed

trusty Ignored
(end of standard support)
upstream
Released (5.6.0-1, 5.6.0)
kinetic Ignored
(end of life, was needed)
xenial Needed

lunar Not vulnerable
(5.6.0-1)
mantic Not vulnerable
(5.6.0-1)
Patches:
upstream: https://gitlab.nic.cz/knot/knot-resolver/-/merge_requests/1380/commits

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H