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CVE-2021-4178

23
FAUCET Score

CVE-2021-4178 is an arbitrary code execution flaw in the Fabric8 Kubernetes client, affecting versions 5.0.0-beta-1 and above, as well as several Red Hat products including AMQ Streams, Build of Quarkus, and OpenShift Application Runtimes. The vulnerability stems from improperly configured YAML parsing, allowing a local, privileged attacker to supply malicious YAML. With a CVSS score of 6.7 (Medium), the attack requires local access and high privileges, but if successful, can lead to high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.0.1, < 5.0.3CPE matchmatch criteria
cpe:2.3:a:redhat:fabric8-kubernetes:*:*:*:*:*:*:*:*
>= 5.1.0, < 5.1.2CPE matchmatch criteria
cpe:2.3:a:redhat:fabric8-kubernetes:*:*:*:*:*:*:*:*
>= 5.2.0, < 5.3.2CPE matchmatch criteria
cpe:2.3:a:redhat:fabric8-kubernetes:*:*:*:*:*:*:*:*
>= 5.5.0, < 5.7.4CPE matchmatch criteria
cpe:2.3:a:redhat:fabric8-kubernetes:*:*:*:*:*:*:*:*
>= 5.9.0, < 5.10.2CPE matchmatch criteria
cpe:2.3:a:redhat:fabric8-kubernetes:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.7MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.31%
Probability of exploitation in next 30 days
EPSS Percentile
23.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0031 is in the 70th percentile among its peer group of 3,720 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (21)

mavenpatch availablevia ghsa
Product: io.fabric8:kubernetes-clientFixed in: 5.0.3
mavenpatch availablevia ghsa
Product: io.fabric8:kubernetes-clientFixed in: 5.1.2
mavenpatch availablevia ghsa
Product: io.fabric8:kubernetes-clientFixed in: 5.3.2
mavenpatch availablevia ghsa
Product: io.fabric8:kubernetes-clientFixed in: 5.7.4
mavenpatch availablevia ghsa
Product: io.fabric8:kubernetes-clientFixed in: 5.8.1
mavenpatch availablevia ghsa
Product: io.fabric8:kubernetes-clientFixed in: 5.10.2
mavenpatch availablevia ghsa
Product: io.fabric8:kubernetes-clientFixed in: 5.11.2
redhatpatch availablevia redhat_api
Product: Red Hat AMQ Streams 2.0.1Fixed in: kubernetes-client
View patch
redhatpatch availablevia redhat_api
Product: OCP-Tools-4.13-RHEL-8Fixed in: jenkins-2-plugins-0:4.13.1684911916-1.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat AMQ Streams 1.6.7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat build of Quarkus 2.2.5Fixed in: kubernetes-client
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Fuse 7.11Fixed in: kubernetes-client
View patch
redhatpatch availablevia redhat_api
Product: RHINT Camel-Q 2.2.1
View patch
redhatpatch availablevia redhat_api
Product: Text-Only RHOARFixed in: kubernetes-client
View patch
redhatvendor investigatingvia nvd_reference
View patch
redhatno patchvia redhat_api
Product: Red Hat build of QuarkusFixed in: kubernetes-client
redhatno patchvia redhat_api
Product: Red Hat Decision Manager 7Fixed in: kubernetes-client
redhatno patchvia redhat_api
Product: Red Hat Process Automation 7Fixed in: kubernetes-client
redhatno patchvia redhat_api
Product: Red Hat Integration Camel K 1Fixed in: kubernetes-client
redhatno patchvia redhat_api
Product: Red Hat Integration Camel Quarkus 1Fixed in: kubernetes-client
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: jenkins-2-plugins

Vendor Advisories (2)

mavenGHSA-98g7-rxmf-rrxmmedium

fabric8 kubernetes-client vulnerable

Jul 15, 2022
redhatCVE-2021-4178Moderate

kubernetes-client: Insecure deserialization in unmarshalYaml method

Jan 5, 2022

References

access.redhat.com / security/cve/CVE-2021-4178
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory
github.com / advisories/GHSA-98g7-rxmf-rrxm
Third Party Advisory
github.com / fabric8io/kubernetes-client/issues/3653
Issue TrackingThird Party Advisory