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Full vulnerability report · 2021
CVE-2021-28312High confidence

Windows NTFS Denial of Service Vulnerability

Microsoft · Windows 10 Version 1809

3.3LowCVSS 3.1
Recommended action
Within 7 days

Low 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 severityLowOperational priority:Low, 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.
  • EPSS is 6.60% 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: No default targetRemediation target: Normal maintenance

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-2021-14997

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

Low 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

Windows NTFS Denial of Service Vulnerability

What

Windows NTFS Denial of Service Vulnerability

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may disrupt the affected service.

What

Windows NTFS Denial of Service Vulnerability

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may disrupt the affected service.

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
local access → vulnerable operation → disrupt the affected service
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
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.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:F/RL:O/RC:C

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

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
UnauthenticatedDenial of servicePublic exploit reference
A

Official authority intelligence

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

Cyber Security Agency of Singapore · English · CSA-SB-20210414Security Bulletin 14 Apr 2021

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 14 Apr 2021, published on 14 April 2021. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-261Multiples vulnérabilités dans Microsoft Windows

d?id=CVE-2021-27091 Référence CVE CVE-2021-27092 https://www.cve.org/CVERecord?id=CVE-2021-27092 Référence CVE CVE-2021-27093 https://www.cve.org/CVERecord?id=CVE-2021-27093 Référence CVE CVE-2021-27094 https://www.cve.org/CVERecord?id=CVE-2021-27094 Référence CVE CVE-2021-27095 https://www.cve.org/CVERecord?id=CVE-2021-27095 Référence CVE CVE-2021-27096 https://www.cve.org/CVERecord?id=CVE-2021-27096 Référence CVE CVE-2021-28309 https://www.cve.org/CVERecord?id=CVE-2021-28309 Référence CVE CVE-2021-28310 https://www.cve.org/CVERecord?id=CVE-2021-28310 Référence CVE CVE-2021-28311 https://www.cve.org/CVERecord?id=CVE-2021-28311 Référence CVE CVE-2021-28312 https://www.cve.org/CVERecord?id=CVE-2021-28312 Référence CVE CVE-2021-28313 https://www.cve.org/CVERecord?id=CVE-2021-28313 Référence CVE CVE-2021-28314 https://www.cve.org/CVERecord?id=CVE-2021-28314 Référence CVE CVE-2021-28315 https://www.cve.org/CVERecord?id=CVE-2021-28315 Référence CVE CVE-2021-28316 https://www.cve.org/CVERecord?id=CVE-2021-28316 Référence CVE CVE-2021-28317 https://www.cve.org/CVERecord?id=CVE-2021-28317 Référence CVE CVE-2021-28318 https://www.cve.org/CVERecord?id=CVE-2021-28318 Référence CVE CVE-2021-28319 https://www.cve.org/CVERecord?id=CVE-2021-28319 Référence CVE CVE-2021-28320 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001497Microsoft Windows 10 および Windows Server におけるサービス運用妨害 (DoS) の脆弱性

Microsoft Windows 10 および Windows Server には、Windows NTFS に不備があるため、サービス運用妨害 (DoS) の脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5297MS 4월 보안 위협에 따른 정기 보안 업데이트 권고

osoft Exchange Server 원격 코드 실행 취약성 Microsoft Exchange Server CVE-2021-28482 Microsoft Exchange Server 원격 코드 실행 취약성 Microsoft Exchange Server CVE-2021-28481 Microsoft Exchange Server 원격 코드 실행 취약성 Microsoft Exchange Server CVE-2021-28480 Microsoft Exchange Server 원격 코드 실행 취약성 Microsoft Graphics Component CVE-2021-28350 Windows GDI+ 원격 코드 실행 취약성 Microsoft Graphics Component CVE-2021-28349 Windows GDI+ 원격 코드 실행 취약성 Microsoft Graphics Component CVE-2021-28348 Windows GDI+ 원격 코드 실행 취약성 Microsoft Graphics Component CVE-2021-28318 Windows GDI+ 정보 유출 취약성 Microsoft Internet Messaging API CVE-2021-27089 Microsoft 인터넷 메시징 API 원격 코드 실행 취약성 Microsoft NTFS CVE-2021-28312 Windows NTFS 서비스 거부 취약성 Microsoft NTFS CVE-2021-27096 NTFS 권한 상승 취약성 Microsoft Office Excel CVE-2021-28456 Microsoft Excel 정보 유출 취약성 Microsoft Office Excel CVE-2021-28454 Microsoft Excel 원격 코드 실행 취약성 Microsoft Office Excel CVE-2021-28451 Microsoft Excel 원격 코드 실행 취약성 Microsoft Office Excel CVE-2021-28449 Microsoft Office 원격 코드 실행 취약성 Microsoft Office Outlook CVE-2021-28452 Microsoft Outlook 메모리 손상 취약성 Microsoft Office SharePoint CVE-2021-28450 Microsoft SharePoint 서비스 업데이트 거부 Microsoft Office Word CVE-2021-28453 Microsoft Word 원격 코드 실행 취약성 Microsoft Windows Codecs Library CVE-2021-28468 Raw Image Extension Remote Code Execution Vulnerability

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 13 Apr 2021 · Last source change 1 Oct 2024, 15:54 UTC · CWE not yet assigned

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-2021-14997
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD modified after enrichment

Missing structured fields: CWE classification. Missing data is not evidence of low risk; review the primary advisory.

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-2021-14997↗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-2021-28312 · cve.blacktree.nl