CVE-2021-25735

EUVD-2021-1071
A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.5 MEDIUM
NETWORK
LOW
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
kubernetesCNA
6.5 MEDIUM
NETWORK
LOW
HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 94%
Affected Products (NVD)
VendorProductVersion
kuberneteskubernetes
𝑥
< 1.18.18
kuberneteskubernetes
1.19.0 ≤
𝑥
< 1.19.10
kuberneteskubernetes
1.20.0 ≤
𝑥
< 1.20.6
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
kubernetes
bookworm
1.20.5+really1.20.2-1.1
fixed
bullseye
1.20.5+really1.20.2-1
fixed
sid
1.20.5+really1.20.2-1.1
fixed
trixie
1.20.5+really1.20.2-1.1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
kubernetes
bionic
dne
focal
needs-triage
groovy
ignored
hirsute
ignored
impish
ignored
jammy
needs-triage
kinetic
ignored
lunar
ignored
mantic
ignored
noble
needs-triage
trusty
dne
xenial
dne
Common Weakness Enumeration
References
https://github.com/kubernetes/kubernetes/issues/100096
https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y
https://github.com/kubernetes/kubernetes/issues/100096
https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y