What is the CVSS score of CVE-2024-20666?

CVE-2024-20666 has a CVSS 3.1 base score of 6.6 (Medium). CVSS vector: CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 15.7%.

How to fix or mitigate CVE-2024-20666?

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

Windows 10 1507 CVE-2024-20666

MEDIUM

Improper Input Validation (CWE-20)

2024-01-09 secure@microsoft.com

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 2016 Windows Server 2019 Windows Server 2022 Windows 11 21H2

6.6

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-20 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V2 - Validation and Business Logic Input validation, allowlisting
Impact	CVSS score of 6.6 (MEDIUM). Attack characteristics: physical attack vector, low complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 15.73%.
Exploit ScenarioDerived	Successful exploitation could compromise the medium-severity affected system.

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

Patch available 15.7% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 28, 2026

BitLocker Security Feature Bypass Vulnerability. Rated medium severity (CVSS 6.6), this vulnerability is low attack complexity. Epss exploitation probability 15.7%.

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-20. Affected products include: Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21H2, Microsoft Windows 10 22H2.

Know when Windows 10 1507 gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 6.6 MEDIUM

AV:P/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

Attack Vector

Physical

Attack Complexity

Low

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

MEDIUM 6.6

DescriptionCVE.org

BitLocker Security Feature Bypass Vulnerability

Executive ViewAI

Why It Matters

CVE-2024-20666 presents notable security risk, a input validation vulnerability rated CVSS 6.6. Exploitation could compromise the security of affected deployments. With an EPSS score of 16%, exploitation is possible in exposed deployments. A patch is available and should be applied during regular vulnerability management.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If patching is delayed: deploy WAF rules, restrict network access, enable logging.

Threat Intelligence Overview

EPSS Score

15.7%

Top 5% 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 15.7%

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

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +16

CVSS: +33

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:*:*:*:*:*:*:*:*

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

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

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_2016:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

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

More in Windows 10 1507

View all

CVE-2021-40444 HIGH Act Now POC

8.8 Sep 15

Windows MSHTML component contains a remote code execution vulnerability that allows attackers to craft malicious ActiveX

CVE-2021-34527 HIGH Act Now POC

8.8 Jul 02

<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged fi

CVE-2022-30190 HIGH Act Now POC

7.8 Jun 01

Windows MSDT (Microsoft Support Diagnostic Tool) allows remote code execution when called via the ms-msdt URL protocol f

CVE-2017-0147 HIGH Act Now POC

7.5 Mar 17

The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows

CVE-2021-1675 HIGH Act Now POC

7.8 Jun 08

Windows Print Spooler Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no auth

CVE-2016-7255 HIGH Act Now POC

7.8 Nov 10

The Win32k kernel-mode driver in Windows Vista through Windows Server 2016 allows local privilege escalation, exploited

CVE-2023-36884 HIGH Act Now POC

7.5 Jul 11

Windows Search Remote Code Execution Vulnerability. Rated high severity (CVSS 7.5), this vulnerability is remotely explo

CVE-2024-30088 HIGH Act Now POC

7.0 Jun 11

Windows Kernel contains a TOCTOU race condition vulnerability allowing local privilege escalation, exploited by the OilR

CVE-2019-1458 HIGH Act Now POC

7.8 Dec 10

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in

CVE-2018-8453 HIGH Act Now POC

7.8 Oct 10

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in

CVE-2025-33053 HIGH Act Now POC

8.8 Jun 10

Windows Internet Shortcut Files (.url) contain an external control vulnerability (CVE-2025-33053, CVSS 8.8) that enables

CVE-2020-1054 HIGH Act Now POC

7.0 May 21

Elevation of privilege in the Windows Win32k kernel-mode driver allows a local, low-privileged attacker to escalate to S

Same weakness CWE-20 – Improper Input Validation

View all

CVE-2021-44228 CRITICAL POC

10.0

CVE-2024-3400 CRITICAL POC

10.0

CVE-2022-47966 CRITICAL POC

9.8

CVE-2023-22515 CRITICAL POC

9.8

CVE-2009-0927 HIGH POC

8.8

CVE-2017-9791 CRITICAL POC

9.8

CVE-2017-15944 CRITICAL POC

9.8

CVE-2019-0604 CRITICAL POC

9.8

Same technique Authentication Bypass

View all

CVE-2015-3306 CRITICAL POC

10.0

CVE-2012-4681 CRITICAL POC

9.8

CVE-2013-2465 CRITICAL POC

9.8

CVE-2011-3544 CRITICAL POC

9.8

CVE-2022-40684 CRITICAL POC

9.8

CVE-2025-61882 CRITICAL POC

9.8

CVE-2024-0012 CRITICAL POC

9.3

References

Advisories & patches

PATCH https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20666

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back