CVE-2023-26249

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
mitreCNA
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CVEADP
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CISA-ADPADP
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 44%
VendorProductVersion
nicknot_resolver
𝑥
< 5.6.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
knot-resolver
bullseye
no-dsa
buster
no-dsa
bookworm
5.6.0-1+deb12u1
fixed
bookworm (security)
5.6.0-1+deb12u1
fixed
trixie
5.7.4-2
fixed
sid
5.7.4-2
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
knot-resolver
oracular
not-affected
noble
not-affected
mantic
not-affected
lunar
not-affected
kinetic
ignored
jammy
needed
focal
needed
bionic
needed
xenial
needed
trusty
ignored
Common Weakness Enumeration
References
https://www.knot-resolver.cz/2023-01-26-knot-resolver-5.6.0.html
https://www.knot-resolver.cz/2023-01-26-knot-resolver-5.6.0.html