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Full vulnerability report · 2021
CVE-2021-1640High confidence

Windows Print Spooler Elevation of Privilege Vulnerability

Microsoft · Windows 10 Version 1507

7.8HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Medium, lowered one band.downgradedsince 19 Aug 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.95% 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.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Microsoft Windows 10 Version 1507 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-2021-7107

No EUVD known-exploited evidence

Windows Print Spooler Elevation of Privilege Vulnerability

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
7.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Windows Print Spooler Elevation of Privilege Vulnerability

What

Windows Print Spooler Elevation of Privilege Vulnerability

Why

The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

Windows Print Spooler Elevation of Privilege Vulnerability

Why

The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

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.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Improper Privilege Management → gain additional privileges
Attack surface
Local
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-269 ↗

CWE-269: Improper Privilege Management. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

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: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.

AVLocalAttack vector: The attacker needs local 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
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
Privilege escalationCWE-269
A

Official authority intelligence

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

ENISA EUVD · EUVD-2021-7107Official EUVD mapping

Windows Print Spooler Elevation of Privilege Vulnerability

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20210317Security Bulletin 17 Mar 2021

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 17 Mar 2021, published on 17 March 2021. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-181Multiples vulnérabilités dans Microsoft Windows

sion 2004 (Server Core installation) Windows Server, version 20H2 (Server Core Installation) Résumé De multiples vulnérabilités ont été corrigées dans Microsoft Windows . Elles permettent à un attaquant de provoquer une élévation de privilèges, un contournement de la fonctionnalité de sécurité, un déni de service, une exécution de code à distance et une atteinte à la confidentialité des données. Solution Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation). Documentation Bulletin de sécurité Microsoft du 09 mars 2021 https://portal.msrc.microsoft.com/fr-FR/security-guidance Référence CVE CVE-2021-1640 https://www.cve.org/CVERecord?id=CVE-2021-1640 Référence CVE CVE-2021-1729 https://www.cve.org/CVERecord?id=CVE-2021-1729 Référence CVE CVE-2021-24090 https://www.cve.org/CVERecord?id=CVE-2021-24090 Référence CVE CVE-2021-24095 https://www.cve.org/CVERecord?id=CVE-2021-24095 Référence CVE CVE-2021-24107 https://www.cve.org/CVERecord?id=CVE-2021-24107 Référence CVE CVE-2021-26860 https://www.cve.org/CVERecord?id=CVE-2021-26860 Référence CVE CVE-2021-26861 https://www.cve.org/CVERecord?id=CVE-2021-26861 Référence CVE CVE-2021-26862 https://www.cve.org/CVERecord?id=CVE-2021-26862 Référence CVE CVE-2021-26863 https://www.cve.org/CVERecord?id=CVE

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001249複数の Microsoft Windows 製品における権限を昇格される脆弱性

複数の Microsoft Windows 製品には、Windows 印刷スプーラに不備があるため、権限を昇格される脆弱性が存在します。 本脆弱性は、CVE-2021-26878 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2021-001218複数の Microsoft Windows 製品における権限を昇格される脆弱性

複数の Microsoft Windows 製品には、Windows 印刷スプーラに不備があるため、権限を昇格される脆弱性が存在します。 本脆弱性は、CVE-2021-1640 とは異なる脆弱性です。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5282MS 3월 보안 위협에 따른 정기 보안 업데이트 권고

우회 취약성 CVE-2021-26891 Windows 컨테이너 실행 에이전트 권한 상승 취약성 CVE-2021-26865 Windows 컨테이너 실행 에이전트 권한 상승 취약성 CVE-2021-24095 DirectX 권한 상승 취약성 CVE-2021-24090 Windows 오류 보고 권한 상승 취약성 CVE-2021-26901 Windows 이벤트 추적 권한 상승 취약성 CVE-2021-26898 Windows 이벤트 추적 권한 상승 취약성 CVE-2021-26872 Windows 이벤트 추적 권한 상승 취약성 CVE-2021-24107 Windows 이벤트 추적 정보 유출 취약성 CVE-2021-26892 Windows 확장 가능 펌웨어 인터페이스 보안 기능 우회 취약성 CVE-2021-26887 Microsoft Windows 폴더 리디렉션 권한 상승 취약성 CVE-2021-26862 Windows Installer 권한 상승 취약성 CVE-2021-26881 Windows 미디어 파운데이션 원격 코드 실행 취약성 CVE-2021-26874 Windows 오버레이 필터 권한 상승 취약성 CVE-2021-26860 Windows 앱-V 오버레이 필터 권한 상승 취약성 CVE-2021-26878 Windows 인쇄 스풀러 권한 상승 취약성 CVE-2021-1640 Windows 인쇄 스풀러 권한 상승 취약성 CVE-2021-26870 Windows 예상 파일 시스템 권한 상승 취약성 CVE-2021-26864 Windows 가상 레지스트리 공급자 권한 상승 취약성 CVE-2021-26882 원격 액세스 API 권한 상승 취약성 CVE-2021-26880 저장소 공간 컨트롤러 권한 상승 취약성 CVE-2021-27070 Windows 10 업데이트 길잡이 권한 상승 취약성 CVE-2021-26889 Windows 업데이트 스택 권한 상승 취약성 CVE-2021-26866 Windows Update Medic Service 권한 상승 취약성 CVE-2021-1729 Windows 업데이트 스택 설정 권한 상승 취약성 CVE-2021-26899 Windows UPnP Device Host 권한 상승 취약성 CVE-2021-26886 사용자 프로필 서비스 서비스 거부 취약성 CVE-2021-26873 Windows 사용자 프로필 서비스 권한 상승 취약성 CVE-2021-26885 Windows WalletService 권한 상승 취약성 CVE-2021-26871 Windows WalletService 권한 상승 취약성 CVE-2021-26900 Windows Win32k 권한 상승 취약성 ##### □ 작성 :

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 10 Mar 2021 · Last source change 19 Aug 2026, 16:30 UTC · CWE-269 · Improper Privilege Management

CVE recordCVE.org · 5.2
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-2021-7107
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
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 ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added remediation: portal.msrc.microsoft.com/CVE-2021-1640; removed patch: msrc.microsoft.com/CVE-2021-1640; removed remediation: msrc.microsoft.com/CVE-2021-1640.
    Before
    patch: msrc.microsoft.com/CVE-2021-1640 · patch: portal.msrc.microsoft.com/CVE-2021-1640 · remediation: msrc.microsoft.com/CVE-2021-1640
    After
    patch: portal.msrc.microsoft.com/CVE-2021-1640 · remediation: portal.msrc.microsoft.com/CVE-2021-1640
    portal.msrc.microsoft.com ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added patch: msrc.microsoft.com/CVE-2021-1640; added remediation: msrc.microsoft.com/CVE-2021-1640; removed remediation: portal.msrc.microsoft.com/CVE-2021-1640.
    Before
    patch: portal.msrc.microsoft.com/CVE-2021-1640 · remediation: portal.msrc.microsoft.com/CVE-2021-1640
    After
    patch: msrc.microsoft.com/CVE-2021-1640 · patch: portal.msrc.microsoft.com/CVE-2021-1640 · remediation: msrc.microsoft.com/CVE-2021-1640
    msrc.microsoft.com ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    10.0.0 < publication · 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.
    After
    10.0.10240.0 < 10.0.10240.18874; 10.0.14393.0 < 10.0.14393.4283; 10.0.0 < 10.0.17134.2087; 10.0.17763.0 < 10.0.17763.1817; 10.0.0 < 10.0.17763.1817; 10.0.0 < 10.0.18363.1440; 10.0.0 < 10.0.19043.867 · 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.
    CNA ↗
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-2021-7107↗Patch or update reference↗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-2021-1640 · cve.blacktree.nl