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CVE-2025-64432

KubeVirt Affected by an Authentication Bypass in Kubernetes Aggregation Layer

MEDIUM
4.7
CVSS Score
Published: November 7, 2025 at 06:38 PM UTC
Updated: June 17, 2026 at 09:54 AM UTC
1 product affected across 1 vendorKubevirt

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.1%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kubevirt· Kubevirt
95%
v < 1.5.3v < 1.6.11.6.01.6.0 rc01.6.0 rc1
Affected range stops below 1.5.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.6.1, so it looks safe — our inference, not a vendor statement

References (4)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/kubevirt/kubevirt/commit/231dc69723f331dc02f65a31ab4c3d6869f40d6a
x_refsource_MISCPatch
Source: [email protected]
https://github.com/kubevirt/kubevirt/commit/af2f08a9a186eccc650f87c30ab3e07b669e8b5b
x_refsource_MISCPatch
Source: [email protected]
https://github.com/kubevirt/kubevirt/commit/b9773bc588e6e18ece896a2dad5336ef7a653074
x_refsource_CONFIRMExploitVendor Advisory
Source: [email protected]
https://github.com/kubevirt/kubevirt/security/advisories/GHSA-38jw-g2qx-4286

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.7MEDIUMGitHub_M
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-287CWE-295

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