What is the CVSS score of CVE-2024-21309?

CVE-2024-21309 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of Windows 11 21H2 are affected by CVE-2024-21309?

CVE-2024-21309 presents notable security risk rated CVSS 7.8. Exploitation could compromise the security of affected deployments.. A patch is available.

How to fix or mitigate CVE-2024-21309?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Windows 11 21H2 CVE-2024-21309

HIGH

Integer Underflow (CWE-191)

2024-01-09 secure@microsoft.com

Integer Overflow Microsoft Information Disclosure Windows 11 21H2 Windows 11 22h2 Windows 11 23h2 Windows Server 2022 Windows Server 2022 23h2 Windows

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:34 vuln.today

Patch released

Mar 28, 2026 - 19:34 nvd

Patch available

CVE Published

Jan 09, 2024 - 18:15 nvd

HIGH 7.8

DescriptionCVE.org

Windows Kernel-Mode Driver Elevation of Privilege Vulnerability

AnalysisAI

Windows Kernel-Mode Driver Elevation of Privilege Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity.

Technical ContextAI

This vulnerability is classified under CWE-191. Windows Kernel-Mode Driver Elevation of Privilege Vulnerability Affected products include: Microsoft Windows 11 21H2, Microsoft Windows 11 22H2, Microsoft Windows 11 23H2, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23H2.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.