---
id: CVE-2025-64432
title: KubeVirt is a virtual machine management add-on for Kubernetes
summary: >-
  KubeVirt is a virtual machine management add-on for Kubernetes. Versions 1.5.3
  and below, and 1.6.0 contained a flawed implementation of the Kubernetes
  aggregation layer's authentication flow which could enable bypass of RBAC
  controls. I…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-287
  - CWE-295
vendor: kubevirt
product: kubevirt
affected:
  - kubevirt < 1.5.3
  - kubevirt = 1.6.0
patched:
  - kubevirt 1.5.3
published: '2025-11-07'
updated: '2026-06-17'
sourceUpdated: '2026-06-17T09:54:22.490'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-64432'
references:
  - url: >-
      https://github.com/kubevirt/kubevirt/commit/231dc69723f331dc02f65a31ab4c3d6869f40d6a
    label: security-advisories@github.com
  - url: >-
      https://github.com/kubevirt/kubevirt/commit/af2f08a9a186eccc650f87c30ab3e07b669e8b5b
    label: security-advisories@github.com
  - url: >-
      https://github.com/kubevirt/kubevirt/commit/b9773bc588e6e18ece896a2dad5336ef7a653074
    label: security-advisories@github.com
  - url: >-
      https://github.com/kubevirt/kubevirt/security/advisories/GHSA-38jw-g2qx-4286
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-11-07T18:54:22.327810Z'
ingestedAt: '2026-09-14T08:34:44.017Z'
epss: 0.00138
epssPercentile: 0.03517
---

## Overview

KubeVirt is a virtual machine management add-on for Kubernetes. Versions 1.5.3 and below, and 1.6.0 contained a flawed implementation of the Kubernetes aggregation layer's authentication flow which could enable bypass of RBAC controls. It was discovered that the virt-api component fails to correctly authenticate the client when receiving API requests over mTLS. In particular, it fails to validate the CN (Common Name) field in the received client TLS certificates against the set of allowed values defined in the extension-apiserver-authentication configmap. Failre to validate certain fields in the client TLS certificate may allow an attacker to bypass existing RBAC controls by directly communicating with the aggregated API server, impersonating the Kubernetes API server and its aggregator component. This issue is fixed in versions 1.5.3 and 1.6.1.

## Affected

- `kubevirt < 1.5.3`
- `kubevirt = 1.6.0`

## Remediation

Upgrade past the affected range:

- `kubevirt 1.5.3`