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Kubevirt CVE-2025-64432

MEDIUM
Improper Authentication (CWE-287)
2025-11-07 security-advisories@github.com
Authentication Bypass Kubernetes Red Hat Suse Kubevirt
4.7
CVSS 3.1 · GitHub Advisory
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Vulnerability Assessment

Weakness
CWE
CWE-287
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 4.7 (MEDIUM). Attack characteristics: local attack vector, high complexity, low privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 0.02%.
Exploit ScenarioDerived

A local attacker with access to the system could bypass authentication mechanisms to gain unauthorized access.
Monitor Track and reassess. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

KubeVirt is a virtual machine management add-on for Kubernetes. Rated medium severity (CVSS 4.7). Public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

Affected Packages

go kubevirt.io/kubevirt fix: 1.5.3, 1.6.0-beta.0.0.20250730135146-231dc69723f3, 1.6.1, 1.7.0-rc.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

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Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. 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 products include: Kubevirt.

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Severity by source

GitHub Advisory PRIMARY 4.7 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE MEDIUM
Red Hat 6.5 MEDIUM

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Patch released
Mar 28, 2026 - 19:21 nvd
Patch available
PoC Detected
Nov 25, 2025 - 15:56 vuln.today
Public exploit code
CVE Published
Nov 07, 2025 - 19:16 nvd
MEDIUM 4.7

DescriptionGitHub Advisory

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.

Executive ViewAI

Why It Matters

Organizations using KubeVirt should be aware of moderate risk from CVE-2025-64432, a improper authentication vulnerability rated CVSS 4.7. This could allow unauthorized access to protected resources. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access, enable MFA, monitor auth logs.

Threat Intelligence Overview

EPSS Score
0.0%
Top 96% exploitable
Exploit
POC
Public exploit code exists

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC Yes
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
Poc
System Exposure· derived
Small
Automatable· derived
No
Human Impact
Low

Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +24
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:kubevirt:kubevirt:*:*:*:*:*:kubernetes:*:*
cpe:2.3:a:kubevirt:kubevirt:1.6.0:-:*:*:*:kubernetes:*:*
cpe:2.3:a:kubevirt:kubevirt:1.6.0:rc0:*:*:*:kubernetes:*:*
cpe:2.3:a:kubevirt:kubevirt:1.6.0:rc1:*:*:*:kubernetes:*:*

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Same weakness CWE-287 – Improper Authentication

View all
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2020-0688 HIGH POC
8.8
CVE-2023-46805 HIGH POC
8.2
CVE-2023-35078 CRITICAL POC
9.8
CVE-2015-1187 CRITICAL POC
9.8
CVE-2024-7593 CRITICAL POC
9.8
CVE-2017-7921 CRITICAL POC
9.8

Same technique Authentication Bypass

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CVE-2015-3306 CRITICAL POC
10.0
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.23 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Containers 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
SUSE Linux Micro 6.2 Fixed
openSUSE Leap 16.0 Fixed

References

Advisories & patches
PATCH https://github.com/kubevirt/kubevirt/commit/231dc69723f331dc02f65a31ab4c3d6869f40d6a PATCH https://github.com/kubevirt/kubevirt/commit/af2f08a9a186eccc650f87c30ab3e07b669e8b5b PATCH https://github.com/kubevirt/kubevirt/commit/b9773bc588e6e18ece896a2dad5336ef7a653074 ADVISORY https://www.suse.com/support/update/SUSE-SU-2025:4330/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20551/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20571/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20610/

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