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Fencer Vulns
high 7.8

CVE-2021-25749 json

runAsNonRoot logic bypass for Windows containers

published 2023-05-24 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-12632

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

Windows workloads can run as ContainerAdministrator even when those workloads set the runAsNonRoot option to true.

Patch / fix

  • Kubernetes Kubernetes v1.22.14, v1.23.11, v1.24.5
  • kubernetes1.23 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Module for Containers 15 SP4 +3 more 1.23.17-150300.7.6.1

suse advisories SUSE-SU-2023:2292-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-25749 updated cvss 3.8

kubelet: runAsNonRoot logic bypass for Windows containers

  • Red Hat OpenShift Container Platform 3.11 atomic-openshift, atomic-openshift-pod, atomic-openshift-node, atomic-openshift-tests, atomic-openshift-master, atomic-openshift-clients, +7 more
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 4 openshift4/ose-tests
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 4.12 openshift4-wincw/windows-machine-config-rhel8-operator 7.0.0-22
    fixed: vendor fix RHSA-2022:9096
  • Red Hat OpenShift Container Platform 4.12 openshift4-wincw/windows-machine-config-operator-bundle v7.0.0-24
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Kubernetes Kubernetes

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.