BlackTreeCVE Intelligence
← Back to the CVE catalogue
Full vulnerability report · 2020
CVE-2020-17075High confidence

Windows USO Core Worker Elevation of Privilege Vulnerability

Microsoft · Windows 10 Version 1803

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 10 Sep 2024

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.73% 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 1803 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-2020-9030

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

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

Patch available
01

What, why and how

Windows USO Core Worker Elevation of Privilege Vulnerability

What

Windows USO Core Worker Elevation of Privilege 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 with low privileges. If successful, the issue may gain additional privileges.

What

Windows USO Core Worker Elevation of Privilege 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 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 → vulnerable operation → 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.
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: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 escalation
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-20201118Security Bulletin 18 Nov 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 18 Nov 2020, published on 18 November 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-738Multiples vulnérabilités dans Microsoft Windows

d?id=CVE-2020-17055 Référence CVE CVE-2020-17056 https://www.cve.org/CVERecord?id=CVE-2020-17056 Référence CVE CVE-2020-17057 https://www.cve.org/CVERecord?id=CVE-2020-17057 Référence CVE CVE-2020-17068 https://www.cve.org/CVERecord?id=CVE-2020-17068 Référence CVE CVE-2020-17069 https://www.cve.org/CVERecord?id=CVE-2020-17069 Référence CVE CVE-2020-17070 https://www.cve.org/CVERecord?id=CVE-2020-17070 Référence CVE CVE-2020-17071 https://www.cve.org/CVERecord?id=CVE-2020-17071 Référence CVE CVE-2020-17073 https://www.cve.org/CVERecord?id=CVE-2020-17073 Référence CVE CVE-2020-17074 https://www.cve.org/CVERecord?id=CVE-2020-17074 Référence CVE CVE-2020-17075 https://www.cve.org/CVERecord?id=CVE-2020-17075 Référence CVE CVE-2020-17076 https://www.cve.org/CVERecord?id=CVE-2020-17076 Référence CVE CVE-2020-17077 https://www.cve.org/CVERecord?id=CVE-2020-17077 Référence CVE CVE-2020-17087 https://www.cve.org/CVERecord?id=CVE-2020-17087 Référence CVE CVE-2020-17088 https://www.cve.org/CVERecord?id=CVE-2020-17088 Référence CVE CVE-2020-17090 https://www.cve.org/CVERecord?id=CVE-2020-17090 Référence CVE CVE-2020-17113 https://www.cve.org/CVERecord?id=CVE-2020-17113 Gestion détaillée du document le 12 novembre 2020 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générale

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-010104Microsoft Windows 10 および Windows Server における権限を昇格される脆弱性

Microsoft Windows 10 および Windows Server には、Windows USO Core Worker 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。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5228MS 11월 보안 위협에 따른 정기 보안 업데이트 권고

Extensions 원격코드실행 취약점 CVE-2020-17113 Windows Camera Codec 정보노출 취약점 Visual Studio CVE-2020-17100 Visual Studio 변조 취약점 CVE-2020-17104 Visual Studio Code JSHint Extension 원격코드실행 취약점 Windows Defender CVE-2020-17090 Microsoft Defender for Endpoint 인증 우회 취약점 Windows Kernel CVE-2020-17035 Windows Kernel 권한상승 취약점 CVE-2020-17087 Windows Kernel Local 권한상승 취약점 Windows NDIS CVE-2020-17069 Windows NDIS 정보노출 취약점 Windows Update Stack CVE-2020-17070 Windows Update Medic Service 권한상승 취약점 CVE-2020-17071 Windows Delivery Optimization 정보노출 취약점 CVE-2020-17073 Windows Update Orchestrator Service 권한상승 취약점 CVE-2020-17074 Windows Update Orchestrator Service 권한상승 취약점 CVE-2020-17075 Windows USO Core Worker 권한상승 취약점 CVE-2020-17076 Windows Update Orchestrator Service 권한상승 취약점 CVE-2020-17077 Windows Update Stack 권한상승 취약점 Windows WalletService CVE-2020-16999 Windows WalletService 정보노출 취약점 CVE-2020-17037 Windows WalletService 권한상승 취약점 ##### □ 작성 : 침해사고분석단 취약점분석팀

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 11 Nov 2020 · Last source change 10 Sept 2024, 15:51 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-2020-9030
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-2020-9030↗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-2020-17075 · cve.blacktree.nl