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Fencer Vulns
low 3.0

CVE-2021-25743 json

ANSI escape characters in kubectl output are not being filtered

published 2022-01-07 4 y ago modified 2026-09-10 1 mo ago also GHSA-f9jg-8p32-2f55 , GO-2022-0983 , EUVD-2022-0579

cvss
3.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

kubectl does not neutralize escape, meta or control sequences contained in the raw data it outputs to a terminal. This includes but is not limited to the unstructured string fields in objects such as Events.

Patch / fix

  • go k8s.io/kubernetes 1.26.0-alpha.3
  • kubernetes Debian 12 1.20.5+really1.20.2-1.1
  • kubernetes Debian 14, Debian 13 1.31.4+ds-1

debian advisories DEBIAN-CVE-2021-25743

  • kubernetes1.23 SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES 15 SP4-LTSS +5 more 1.23.17-150300.7.12.1
  • kubernetes1.24 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +1 more 1.24.17-150300.7.6.1
  • kubernetes1.24 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.24.17-150400.9.16.1
  • kubernetes1.25 SLE Module for Containers 15 SP6, SLE Module for Containers 15 SP5, openSUSE Leap 15.6 +1 more 1.25.16-150400.9.10.1
  • kubernetes1.24 SLE Module for Containers 15 SP5, openSUSE Leap 15.6, openSUSE Leap 15.5 1.24.17-150500.3.19.1
  • kubernetes1.23 SLE Module for Containers 15 SP5, openSUSE Leap 15.6, openSUSE Leap 15.5 1.23.17-150500.3.15.1

suse advisories SUSE-SU-2025:02423-2SUSE-SU-2024:3343-1SUSE-SU-2024:3341-1SUSE-SU-2024:2928-1SUSE-SU-2024:2859-1SUSE-SU-2024:2858-1

  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20250807T150727-1.1

opensuse advisories openSUSE-SU-2025:15424-1

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-2021-25743 updated cvss 3.0

kubernetes: kubectl does not neutralize escape, meta or control sequences contained in the raw data it outputs to a terminal

  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/agent-service-rhel8
    affected: no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 1.2 kubernetes Red Hat Ansible Tower 3 kubernetes
    affected: no fix available
  • 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 Red Hat OpenShift Container Platform 4 openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift-kube-apiserver, openshift-kube-scheduler, +2 more
    affected: no fix available “Fix deferred”

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

Exploit prediction

0.84% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N
NVD 3.1 3.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N
NVD 2.0 2.1 AV:N/AC:H/Au:S/C:N/I:P/A:N
GitHub 3.1 3.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
go k8s.io/kubernetes
<1.26.0-alpha.3
1.26.0-alpha.3

Affected products

  • Kubernetes Kubernetes

Classification

Weakness
  • CWE-150 Improper Neutralization of Escape, Meta, or Control Sequences
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.