What is the CVSS score of CVE-2024-21306?

CVE-2024-21306 has a CVSS 3.1 base score of 5.7 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N. EPSS exploitation probability: 29.6%.

How to fix or mitigate CVE-2024-21306?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Audit authentication configurations.

Windows 10 21h2 CVE-2024-21306

MEDIUM

Missing Authentication for Critical Function (CWE-306)

2024-01-09 secure@microsoft.com

Authentication Bypass Microsoft Windows 10 21h2 Windows 10 22h2 Windows 11 22h2 Windows 11 23h2 Windows Server 2022 Windows Server 2022 23h2 Windows 11 21H2

5.7

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-306 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Authentication required for critical functions MITRE ATT&CK 1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 5.7 (MEDIUM). Attack characteristics: adjacent network attack vector, low complexity, no privileges required, user interaction required. EPSS exploitation probability: 29.55%.
Exploit ScenarioDerived	An attacker could exploit this vulnerability to access critical functionality without authentication. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 29.6% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Microsoft Bluetooth Driver Spoofing Vulnerability. Rated medium severity (CVSS 5.7), this vulnerability is no authentication required, low attack complexity. Epss exploitation probability 29.6%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Require authentication for all sensitive operations, implement defense in depth.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Missing Authentication for Critical Function (CWE-306), which allows attackers to access critical functionality without authentication. Affected products include: Microsoft Windows 10 21H2, Microsoft Windows 10 22H2, Microsoft Windows 11 21H2, Microsoft Windows 11 22H2, Microsoft Windows 11 23H2.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 5.7 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Patch released

Mar 28, 2026 - 19:34 nvd

Patch available

CVE Published

Jan 09, 2024 - 18:15 nvd

MEDIUM 5.7

DescriptionCVE.org

Microsoft Bluetooth Driver Spoofing Vulnerability

Executive ViewAI

Why It Matters

CVE-2024-21306 presents moderate security risk, a missing authentication vulnerability rated CVSS 5.7. This could allow unauthorized access to protected resources. With an EPSS score of 30%, exploitation is possible in exposed deployments. 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

29.6%

Top 3% exploitable

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 No

EPSS 29.6%

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

None

System Exposure· derived

Controlled

Automatable· derived

Human Impact

Low

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +30

CVSS: +28

PoC: 0

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)CVE.org

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21306

Search Externally

GitHub PoC

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