CVE-2021-41254: kustomize-controller is a Kubernetes operator, specialized in running continuous delivery pipelines for infras

Q: How do I fix CVE-2021-41254?

kustomize-controller: upgrade to 0.15.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-41254 being exploited?

CVE-2021-41254 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-41254 affect?

CVE-2021-41254 affects kustomize-controller. Severity is high (CVSS 8.8). kustomize-controller is a Kubernetes operator, specialized in running continuous delivery pipelines for infrastructure and workloads defined with Kubernetes manifests and assembled with Kustomize. Users that can create Kubernetes Secrets, S

Q: How urgent is CVE-2021-41254?

Priority 60/100. High severity; Public exploit reference; On your watchlist

This week

HIGH 8.8WATCHLISTUPGRADE

CVE-2021-41254 is a high-severity flaw (CVSS 8.8) affecting kustomize-controller. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

kustomize-controller is a Kubernetes operator, specialized in running continuous delivery pipelines for infrastructure and workloads defined with Kubernetes manifests and assembled with Kustomize. Users that can create Kubernetes Secrets, Service Accounts and Flux Kustomization objects, could execute commands inside the kustomize-controller container by embedding a shell script in a Kubernetes Secret. This can be used to run `kubectl` commands un

Why this priority

High severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Weakness	CWE-78
Published	2021-11-12
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fluxcd

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-11-12 18:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

fluxcd kustomize-controller UPGRADE

Affected: < 0.15.0

Fixed in: 0.15.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kustomize-controller || rpm -q kustomize-controller || kustomize-controller --version

2. UPGRADE to 0.15.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kustomize-controller

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kustomize-controller

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-41254?

kustomize-controller: upgrade to 0.15.0. Exact commands for each OS are on this page.

Is CVE-2021-41254 being exploited?

CVE-2021-41254 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-41254 affect?

CVE-2021-41254 affects kustomize-controller. Severity is high (CVSS 8.8). kustomize-controller is a Kubernetes operator, specialized in running continuous delivery pipelines for infrastructure and workloads defined with Kubernetes manifests and assembled with Kustomize. Users that can create Kubernetes Secrets, S

How urgent is CVE-2021-41254?

Priority 60/100. High severity; Public exploit reference; On your watchlist

Software pages

Kubernetes vulnerabilities

Related CVEs

CVE-2022-39272 MEDIUM 5.0 UPGRADE UPGRADE Flux is an open and extensible continuous delivery solution for Kubernetes

References

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