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Full vulnerability report · 2024
CVE-2024-20666High confidence

BitLocker Security Feature Bypass Vulnerability

Microsoft · Windows 10 Version 1809

6.6MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 3.10% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Microsoft Windows 10 Version 1809 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2024-18381

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

BitLocker Security Feature Bypass Vulnerability

What

BitLocker Security Feature Bypass Vulnerability

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through physical access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

BitLocker Security Feature Bypass Vulnerability

Why

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How

An attacker operating through physical access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.

Likely attack path
physical access → Improper Input Validation → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Physical
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-20 ↗

CWE-20: Improper Input Validation. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVPhysicalAttack vector: The attacker needs physical access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
CWE-20Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2024-0036Microsoft Windows und Microsoft Windows Server: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows und Microsoft Windows Server ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuführen, seine Berechtigungen zu erweitern und Informationen falsch darzustellen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20240110Security Bulletin 10 Jan 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 10 Jan 2024, published on 10 January 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0021Multiples vulnérabilités dans Microsoft Windows

janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20660 Bulletin de sécurité Microsoft CVE-2024-20661 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20661 Bulletin de sécurité Microsoft CVE-2024-20662 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20662 Bulletin de sécurité Microsoft CVE-2024-20663 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20663 Bulletin de sécurité Microsoft CVE-2024-20664 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20664 Bulletin de sécurité Microsoft CVE-2024-20666 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20666 Bulletin de sécurité Microsoft CVE-2024-20674 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20674 Bulletin de sécurité Microsoft CVE-2024-20680 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20680 Bulletin de sécurité Microsoft CVE-2024-20681 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20681 Bulletin de sécurité Microsoft CVE-2024-20682 du 09 janvier 2024 https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-20682 Bulletin de sécurité Micr

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2024-001010マイクロソフトの複数の Microsoft Windows 製品におけるセキュリティ機能を回避される脆弱性

マイクロソフトの Microsoft Windows 10、Windows 11、Windows Server には、BitLocker に不備があるため、セキュリティ機能を回避される脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6102MS 2월 보안 위협에 따른 정기 보안 업데이트 권고

porated: CVE-2024-20709 Javascript 구현 PDF 취약성 | | Skype for Business | CVE-2024-20695 | 비즈니스용 Skype 정보 유출 취약성 | | Windows Hyper-V | CVE-2024-20684 | Windows Hyper-V 서비스 거부 취약성 | | Azure Stack | CVE-2024-20679 | Azure Stack Hub 스푸핑 취약성 | | Microsoft Office | CVE-2024-20677 | Microsoft Office 원격 코드 실행 취약성 | | Microsoft Edge (Chromium-based) | CVE-2024-20675 | Microsoft Edge(Chromium 기반) 보안 기능 우회 취약성 | | Windows Authentication Methods | CVE-2024-20674 | Windows Kerberos 보안 기능 바이패스 취약성 | | Microsoft Office | CVE-2024-20673 | Microsoft Office 원격 코드 실행 취약성 | | Azure DevOps | CVE-2024-20667 | Azure DevOps Server 원격 코드 실행 취약성 | | Windows BitLocker | CVE-2024-20666 | BitLocker 보안 기능 우회 취약성 | | Microsoft Virtual Hard Drive | CVE-2024-20658 | Microsoft 가상 하드 디스크 권한 상승 취약성 | | Microsoft Edge (Chromium-based) | CVE-2024-1284 | Chromium: CVE-2024-1284 Mojo에서 UaF(Use after free) | | Microsoft Edge (Chromium-based) | CVE-2024-1283 | Chromium: CVE-2024-1283 Skia에서 힙 버퍼 오버플로 | | Microsoft Edge (Chromium-based) | CVE-2024-1077 | Chromium: CVE-2024-1077 네트워크에서 UaF(Use after free) | | Microsoft Edge (Chromium-based) | CVE-2024-1060 | Chromium: CVE-2024-1060 캔버스에서 UaF(Use after free) | | Microsoft Edge (Chromium-based) | CVE-2024-1059 | Chromium: CVE-2024-1059 WebRTC에서 UaF(Use after free) | | Microsoft Edge (Chromi

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6068MS 1월 보안 위협에 따른 정기 보안 업데이트 권고

el Subsystem | CVE-2024-20686 | Win32k 권한 상승 취약성 | | Windows Win32K | CVE-2024-20683 | Win32k 권한 상승 취약성 | | Windows Cryptographic Services | CVE-2024-20682 | Windows 암호화 서비스 원격 코드 실행 취약성 | | Windows Subsystem for Linux | CVE-2024-20681 | Linux용 Windows 하위 시스템 권한 상승 취약성 | | Windows Message Queuing | CVE-2024-20680 | Windows MSMQC(메시지 큐 클라이언트) 정보 공개 | | Microsoft Office | CVE-2024-20677 | Microsoft Office 원격 코드 실행 취약성 | | Azure Storage Mover | CVE-2024-20676 | Azure Storage Mover 원격 코드 실행 취약성 | | Windows Authentication Methods | CVE-2024-20674 | Windows Kerberos 보안 기능 바이패스 취약성 | | .NET | CVE-2024-20672 | .NET 서비스 거부 취약성 | | Windows BitLocker | CVE-2024-20666 | BitLocker 보안 기능 우회 취약성 | | Windows Message Queuing | CVE-2024-20664 | Microsoft 메시지 큐 정보 유출 취약성 | | Windows Message Queuing | CVE-2024-20663 | Windows MSMQC(메시지 큐 클라이언트) 정보 공개 | | Windows Online Certificate Status Protocol (OCSP) SnapIn | CVE-2024-20662 | Windows OCSP(온라인 인증서 상태 프로토콜) 정보 공개 취약성 | | Windows Message Queuing | CVE-2024-20661 | Microsoft 메시지 큐 서비스 거부 취약성 | | Windows Message Queuing | CVE-2024-20660 | Microsoft 메시지 큐 정보 유출 취약성 | | Microsoft Virtual Hard Drive | CVE-2024-20658 | Microsoft 가상 하드 디스크 권한 상승 취약성 | | Windows Group Policy | CVE-2024-20657 | Windows 그룹 정책 권한 상승 취약성 | | Visual Studio | CVE-2024-20656 | Visual Studio 권한

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 9 Jan 2024 · Last source change 3 May 2025, 01:46 UTC · CWE-20 · Improper Input Validation

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2024-18381
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2024-18381↗CISA Vulnrichment SSVC evidence↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2024-20666 · cve.blacktree.nl