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CVE-2023-2727

MEDIUM
Published 2023-07-03T20:05:04.329Z
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CVSS Score

V3.1
6.5
/10
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.400
Higher than 40.0% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
NONE

Description

Users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers.

Understanding This Vulnerability

This Common Vulnerabilities and Exposures (CVE) entry provides detailed information about a security vulnerability that has been publicly disclosed. CVEs are standardized identifiers assigned by MITRE Corporation to track and catalog security vulnerabilities across software and hardware products.

The severity rating (MEDIUM) indicates the potential impact of this vulnerability based on the CVSS (Common Vulnerability Scoring System) framework. Higher severity ratings typically indicate vulnerabilities that could lead to more significant security breaches if exploited. Security teams should prioritize remediation efforts based on severity, exploit availability, and the EPSS (Exploit Prediction Scoring System) score, which predicts the likelihood of exploitation in the wild.

If this vulnerability affects products or systems in your infrastructure, we recommend reviewing the affected products section, checking for available patches or updates from vendors, and implementing recommended workarounds or solutions until a permanent fix is available. Organizations should also monitor security advisories and threat intelligence feeds for updates about active exploitation of this vulnerability.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

References

Workarounds

Prior to upgrading, this vulnerability can be mitigated by running validation webhooks (such as Gatekeeper and Kyverno) to enforce the same restrictions for ephemeral containers.

Solutions

To mitigate this vulnerability, upgrade Kubernetes: https://kubernetes.io/docs/tasks/administer-cluster/cluster-management/#upgrading-a-cluster https://kubernetes.io/docs/tasks/administer-cluster/cluster-management/#upgrading-a-cluster

Credits & Acknowledgments

reporter

Stanislav Láznička

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

kube-apiserver vulnerable to policy bypass

GHSA-qc2g-gmh6-95p4

Advisory Details

Users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers.

Affected Packages

Go k8s.io/kubernetes
ECOSYSTEM: ≥1.27.0 <1.27.3
Go k8s.io/kubernetes
ECOSYSTEM: ≥1.26.0 <1.26.6
Go k8s.io/kubernetes
ECOSYSTEM: ≥1.25.0 <1.25.11
Go k8s.io/kubernetes
ECOSYSTEM: ≥0 <1.24.15

CVSS Scoring

CVSS Score

5.0

CVSS Vector

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

Advisory provided by GitHub Security Advisory Database. Published: July 3, 2023, Modified: February 13, 2025

References

Published: 2023-07-03T20:05:04.329Z
Last Modified: 2025-02-13T16:45:04.559Z
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