CVE-2019-1064
HighExploitedPublic exploitAn elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links.
Published Jun 12, 2019 · Updated Oct 29, 2025
Key Facts
Patch immediately- CVE-2019-1064 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 1607 (Microsoft), Windows 10 1703 (Microsoft), Windows 10 1709 (Microsoft) and 21 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 15, 2022 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 6.9% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 Version 1607 publication, Windows 10 Version 1703 publication, Windows 10 Version 1709 publication.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
6.9%
Higher than 93.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2019-1064 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context. An attacker could then install programs; view, change or delete data. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system. The security update addresses the vulnerability by correcting how Windows AppX Deployment Service handles hard links.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 15, 2022 | Apr 5, 2022 | Known |
| Industry KEV feed | Mar 15, 2022 | Apr 5, 2022 | Known |
| CIRCL KEV | Mar 15, 2022 | Apr 5, 2022 | Known |
| ENISA EUVD | Mar 15, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
36 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1607Microsoft | See advisory | n/a |
| Windows 10 1703Microsoft | See advisory | n/a |
| Windows 10 1709Microsoft | See advisory | n/a |
| Windows 10 1803Microsoft | See advisory | n/a |
| Windows 10 1809Microsoft | See advisory | n/a |
Patched Releases
Windows 10 Version 1607
publication
Windows 10 Version 1703
publication
Windows 10 Version 1709
publication
Windows 10 Version 1709 for 32-bit Systems
publication
Windows 10 Version 1803
publication
Windows 10 Version 1809
publication
Windows 10 Version 1903 for 32-bit Systems
publication
Windows 10 Version 1903 for ARM64-based Systems
publication
Windows 10 Version 1903 for x64-based Systems
publication
Windows Server 2016
publication
Windows Server 2016 (Server Core installation)
publication
Windows Server 2019
publication
Windows Server 2019 (Server Core installation)
publication
Windows Server, version 1803 (Server Core Installation)
publication
Windows Server, version 1903 (Server Core installation)
publication
Timeline
Publicly disclosed
Jun 12, 2019
Added to CISA KEV
Mar 15, 2022
Added to Industry KEV feed
Mar 15, 2022
Added to CIRCL KEV
Mar 15, 2022
Added to ENISA EUVD
Mar 15, 2022
Last updated
Oct 29, 2025
Weakness Type
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
References
- patchWindows Elevation of Privilege Vulnerability
- patchhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1064
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links.
Affected: Windows 10 1607 (Microsoft); Windows 10 1703 (Microsoft); Windows 10 1709 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 15, 2022 and is known to be used in ransomware campaigns.
Yes. It was added on Mar 15, 2022 with a federal remediation due date of Apr 5, 2022.
Public exploit code is available.
Fixed versions are available, including Windows 10 Version 1607 publication, Windows 10 Version 1703 publication, Windows 10 Version 1709 publication.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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