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Full vulnerability report · 2019
CVE-2019-0841High confidence

Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability

Microsoft · Windows

7.8HighCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2022-04-05 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 15 Mar 2022

Evidence used

  • CISA confirms exploitation in the wild.
  • A structured source references public exploit or proof-of-concept material.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 41.40% 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 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: Within 3 daysRemediation target: Within 90 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-2019-1592

CISA KEV mirrored by ENISA

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0730, CVE-2019-0731, CVE-2019-0796, CVE-2019-0805, CVE-2019-0836.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 15 Mar 2022. Evidence sources: cisa_kev.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2022-04-05 as the remediation due date.

Patch available
01

What, why and how

A privilege escalation vulnerability exists when Windows AppXSVC improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context.

What

A privilege escalation vulnerability exists when Windows AppXSVC improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context.

Why

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

How

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

What

A privilege escalation vulnerability exists when Windows AppXSVC improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context.

Why

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2022-03-15. Known ransomware campaign use is recorded.

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

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Improper Link Resolution Before File Access ('Link Following') → 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-59 ↗

CWE-59: Improper Link Resolution Before File Access ('Link Following'). The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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

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-59CISA KEVPublic exploit reference
A

Official authority intelligence

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

ENISA EUVD · EUVD-2019-1592Known-exploited evidence recorded

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0730, CVE-2019-0731, CVE-2019-0796, CVE-2019-0805, CVE-2019-0836.

Official EUVD record ↗
Canadian Centre for Cyber Security · English · AV19-106Microsoft Zero Day Proof of Concept Code Advisory

The Cyber Centre is aware of recently published Proof of Concepts that expose four new Zero Day vulnerabilities affecting Microsoft Windows (Primarily Windows 10 and Windows Server 2016/2019). The exploitability of these vulnerabilities vary in complexity, though all would require authenticated access to the target system in order to be successful. Nevertheless, a malicious actor could use these as part of an exploitation chain to escalate their privileges after gaining low-privileged access to a system. The four vulnerabilities, along with names they have been given in GitHub and a brief description, are: Microsoft has not yet announced security updates for these vulnerabilities. CCCS advises that security updates be applied once they are available.

Official advisory ↗
CERT-FR · French · CERTFR-2019-AVI-158Multiples vulnérabilités dans Microsoft Windows

.cve.org/CVERecord?id=CVE-2019-0803 Référence CVE CVE-2019-0805 https://www.cve.org/CVERecord?id=CVE-2019-0805 Référence CVE CVE-2019-0813 https://www.cve.org/CVERecord?id=CVE-2019-0813 Référence CVE CVE-2019-0814 https://www.cve.org/CVERecord?id=CVE-2019-0814 Référence CVE CVE-2019-0836 https://www.cve.org/CVERecord?id=CVE-2019-0836 Référence CVE CVE-2019-0837 https://www.cve.org/CVERecord?id=CVE-2019-0837 Référence CVE CVE-2019-0838 https://www.cve.org/CVERecord?id=CVE-2019-0838 Référence CVE CVE-2019-0839 https://www.cve.org/CVERecord?id=CVE-2019-0839 Référence CVE CVE-2019-0840 https://www.cve.org/CVERecord?id=CVE-2019-0840 Référence CVE CVE-2019-0841 https://www.cve.org/CVERecord?id=CVE-2019-0841 Référence CVE CVE-2019-0842 https://www.cve.org/CVERecord?id=CVE-2019-0842 Référence CVE CVE-2019-0844 https://www.cve.org/CVERecord?id=CVE-2019-0844 Référence CVE CVE-2019-0845 https://www.cve.org/CVERecord?id=CVE-2019-0845 Référence CVE CVE-2019-0846 https://www.cve.org/CVERecord?id=CVE-2019-0846 Référence CVE CVE-2019-0847 https://www.cve.org/CVERecord?id=CVE-2019-0847 Référence CVE CVE-2019-0848 https://www.cve.org/CVERecord?id=CVE-2019-0848 Référence CVE CVE-2019-0849 https://www.cve.org/CVERecord?id=CVE-2019-0849 Référence CVE CVE-2019-0851 https://www.cve.org/CVERecord?id=CVE-2019-0851 Ré

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-002676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、LUAFV ドライバ (luafv.sys) に対する呼び出しを正しく処理しない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Windows の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2019-0731、CVE-2019-0796、CVE-2019-0805、CVE-2019-0836、CVE-2019-0841 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-002675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、LUAFV ドライバ (luafv.sys) に対する呼び出しを正しく処理しない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Windows の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2019-0730、CVE-2019-0796、CVE-2019-0805、CVE-2019-0836、CVE-2019-0841 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-002659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、LUAFV ドライバ (luafv.sys) に対する呼び出しを適切に処理しない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Windows の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2019-0730、CVE-2019-0731、CVE-2019-0796、CVE-2019-0836、CVE-2019-0841 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-002647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 AppX Deployment Service (AppXSVC) がハードリンクを適切に処理しない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Windows の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2019-0730、CVE-2019-0731、CVE-2019-0796、CVE-2019-0805、CVE-2019-0836 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-002642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、LUAFV ドライバー (luafv.sys) に対する呼び出しを適切に処理しない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Windows の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2019-0730、CVE-2019-0731、CVE-2019-0796、CVE-2019-0805、CVE-2019-0841 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2019-002667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、LUAFV ドライバ (luafv.sys) に対する呼び出しを適切に処理しない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Windows の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2019-0730、CVE-2019-0731、CVE-2019-0805、CVE-2019-0836、CVE-2019-0841 とは異なる脆弱性です。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5001MS 4월 보안 위협에 따른 정기 보안 업데이트 권고

- 권한상승 취약점(CVE-2019-0685,CVE-2019-0730,CVE-2019-0731,CVE-2019-0735,CVE-2019-0796,CVE-2019-0803,CVE-2019-0805,CVE-2019-0841,CVE-2019-0875)

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 Apr 2019 · Last source change 21 Oct 2025, 23:45 UTC · CWE-59 · Improper Link Resolution Before File Access ('Link Following')

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2019-1592
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCISA ADP
NVD statusNVD enriched

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. ENISA known-exploited stateENISA EUVD now records this CVE in its known-exploited dataset.
    Before
    not listed in ENISA EUVD known-exploited dataset
    After
    listed in ENISA EUVD known-exploited dataset (EUVD-2019-1592)
    ENISA EUVD ↗
  2. ENISA EUVD mappingEUVD-2019-1592 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2019-1592"}
    ENISA EUVD ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    10 Version 1703 for 32-bit Systems; 10 Version 1703 for x64-based Systems; 10 Version 1709 for 32-bit Systems; 10 Version 1709 for x64-based Systems; 10 Version 1803 for 32-bit Systems; 10 Version 1803 for x64-based Systems; 10 Version 1803 for ARM64-based Systems; 10 Version 1809 for 32-bit Systems · 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
    Windows: 10 Version 1703 for 32-bit Systems, 10 Version 1703 for x64-based Systems, 10 Version 1709 for 32-bit Systems, 10 Version 1709 for x64-based Systems, 10 Version 1803 for 32-bit Systems, 10 Version 1803 for x64-based Systems, 10 Version 1803 for ARM64-based Systems, 10 Version 1809 for 32-bit Systems, 10 Version 1809 for x64-based Systems, 10 Version 1809 for ARM64-based Systems, 10 Version 1709 for ARM64-based Systems; Windows Server: version 1709 (Core Installation), version 1803 (Core Installation), 2019, 2019 (Core installation) · 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 ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: added patch: portal.msrc.microsoft.com/CVE-2019-0841; added remediation: portal.msrc.microsoft.com/CVE-2019-0841.
    Before
    no authoritative guidance recorded
    After
    patch: portal.msrc.microsoft.com/CVE-2019-0841 · remediation: portal.msrc.microsoft.com/CVE-2019-0841
    portal.msrc.microsoft.com ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    10 Version 1703 for 32-bit Systems; 10 Version 1703 for x64-based Systems; 10 Version 1709 for 32-bit Systems; 10 Version 1709 for x64-based Systems; 10 Version 1803 for 32-bit Systems; 10 Version 1803 for x64-based Systems; 10 Version 1803 for ARM64-based Systems; 10 Version 1809 for 32-bit Systems · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    10 Version 1703 for 32-bit Systems; 10 Version 1703 for x64-based Systems; 10 Version 1709 for 32-bit Systems; 10 Version 1709 for x64-based Systems; 10 Version 1803 for 32-bit Systems; 10 Version 1803 for x64-based Systems; 10 Version 1803 for ARM64-based Systems; 10 Version 1809 for 32-bit Systems · 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 ↗
  6. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    portal.msrc.microsoft.com ↗
  7. CVSS scoreCVSS scoring authority changed from CISA ADP to NIST NVD; the displayed base score remained 7.8.
    Before
    7.8 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
    After
    7.8 (CVSS 3.1 · NIST NVD · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
    NIST NVD ↗
  8. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2019-1592↗CISA KEV record↗CVE authority or vendor reference↗Public exploit reference↗Public exploit 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-2019-0841 · cve.blacktree.nl