What is the CVSS score of CVE-2024-20657?

CVE-2024-20657 has a CVSS 3.1 base score of 7.0 (High). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

How to fix or mitigate CVE-2024-20657?

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

Windows CVE-2024-20657

HIGH

Improper Access Control (CWE-284)

2024-01-09 secure@microsoft.com

Windows Authentication Bypass Microsoft Windows 10 1507 Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 22h2 Windows 11 22h2 Windows 11 23h2 Windows Server 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows 11 21H2

7.0

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-284 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V8 - Authorization Access control enforcement MITRE ATT&CK 1 technique across 1 tactic: Defense Evasion 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 7.0 (HIGH). Attack characteristics: local attack vector, high complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 0.27%.
Exploit ScenarioDerived	Successful exploitation could compromise the high-severity affected system.

This Month Plan within 30 days. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 28, 2026

Windows Group Policy Elevation of Privilege Vulnerability. Rated high severity (CVSS 7.0).

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.

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 under CWE-284. Affected products include: Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21H2, Microsoft Windows 10 22H2.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.0 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 28, 2026 - 19:34 nvd

Patch available

CVE Published

Jan 09, 2024 - 18:15 nvd

HIGH 7.0

DescriptionCVE.org

Windows Group Policy Elevation of Privilege Vulnerability

Executive ViewAI

Why It Matters

CVE-2024-20657 presents moderate security risk, a improper access control vulnerability rated CVSS 7.0. Exploitation could compromise the security of affected deployments. A patch is available and should be applied as part of regular vulnerability management.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Restrict access to affected endpoints; (2) Implement additional authorization checks; (3) Enable audit logging.

Threat Intelligence Overview

EPSS Score

0.3%

Top 50% 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 HIGH

CISA KEV No

Public POC No

EPSS 0.3%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +35

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_1507:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*

cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*

cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*

+ 6 more

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References

Advisories & patches

PATCH https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20657

Search Externally

GitHub PoC

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