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CVE-2025-64432— KubeVirt Affected by an Authentication Bypass in Kubernetes Aggregation Layer

Quick assessment

Affected
kubevirt kubevirt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubevirt是KubeVirt开源的一款虚拟机管理器。 Kubevirt 1.5.3及之前版本和1.6.0版本存在信任管理问题漏洞，该漏洞源于virt-api组件未能正确验证客户端TLS证书中的CN字段，可能导致绕过RBAC控制。

CVSS 4.7 · Medium EPSS 0.14% · P3
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I. Basic Information for CVE-2025-64432

Vulnerability Information
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Vulnerability Title
KubeVirt Affected by an Authentication Bypass in Kubernetes Aggregation Layer
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Kubevirt 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubevirt是KubeVirt开源的一款虚拟机管理器。 Kubevirt 1.5.3及之前版本和1.6.0版本存在信任管理问题漏洞，该漏洞源于virt-api组件未能正确验证客户端TLS证书中的CN字段，可能导致绕过RBAC控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kubevirt kubevirt < 1.5.3 -

II. Public POCs for CVE-2025-64432

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III. Intelligence Information for CVE-2025-64432

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Patches & Fixes for CVE-2025-64432 (1)

Vendor Advisories for CVE-2025-64432 (1)

Same Patch Batch · kubevirt · 2025-11-07 · 6 CVEs total

CVE-2025-64433 6.5 MEDIUM KubeVirt Arbitrary Container File Read
CVE-2025-64435 5.3 MEDIUM KubeVirt VMI Denial-of-Service (DoS) Using Pod Impersonation
CVE-2025-64437 5.0 MEDIUM KubeVirt Isolation Detection Flaw Allows Arbitrary File Permission Changes
CVE-2025-64434 4.7 MEDIUM KubeVirt Improper TLS Certificate Management Handling Allows API Identity Spoofing
CVE-2025-64436 KubeVirt Excessive Role Permissions Could Enable Unauthorized VMI Migrations Between Nodes

IV. Related Vulnerabilities

Same product: kubevirt
Same vendor: kubevirt
Same weakness: CWE-287

V. Comments for CVE-2025-64432

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