Microsoft Windows

CVE-2019-0841: Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 15 Mar 2022, 1,071 days after the CVE record was published.

How likely is exploitation in the next 30 days?

41.4%

EPSS score, percentile 98.7 of all scored records

How severe?

7.8 High

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline 5 Apr 2022. Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

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

and 9 more in the table below

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

Required action, set by CISA

Apply updates per vendor instructions.

CISA due date for this action: 5 April 2022.

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

https://nvd.nist.gov/vuln/detail/CVE-2019-0841

Affected products and versions

As listed in the CVE record.

Microsoft Windows
Status	Versions
Affected	10 Version 1703 for 32-bit Systems
Affected	10 Version 1703 for x64-based Systems
Affected	10 Version 1709 for 32-bit Systems
Affected	10 Version 1709 for x64-based Systems
Affected	10 Version 1803 for 32-bit Systems
Affected	10 Version 1803 for x64-based Systems
Affected	10 Version 1803 for ARM64-based Systems
Affected	10 Version 1809 for 32-bit Systems
Affected	10 Version 1809 for x64-based Systems
Affected	10 Version 1809 for ARM64-based Systems
Affected	10 Version 1709 for ARM64-based Systems

Microsoft Windows Server
Status	Versions
Affected	version 1709 (Core Installation)
Affected	version 1803 (Core Installation)
Affected	2019
Affected	2019 (Core installation)

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

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.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

CISA added CVE-2019-0841 to its Known Exploited Vulnerabilities (KEV) catalog on 15 Mar 2022.
CISA marks it as known to be used in ransomware campaigns.
The due date CISA sets for the required action is 5 Apr 2022.
The CVE record was published on 9 Apr 2019, 1,071 days before it was added to KEV.
The CVE record carries a CVSS v3.1 base score of 7.8 (High), taken from CISA's enrichment of the record.
FIRST's EPSS model puts the probability of exploitation in the next 30 days at 41.4% (percentile 98.7), as of 28 Oct 2026.
CISA's SSVC assessment in the CVE record: exploitation active, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

CWE-59: Improper Link Resolution Before File Access ('Link Following')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

Date	Event
9 Apr 2019	CVE record published
15 Mar 2022	Added to CISA KEV
5 Apr 2022	CISA due date for the required action
21 Oct 2025	CVE record last updated

References

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