An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links, aka 'Windows El

Summary

The Windows AppX Deployment Service (AppXSVC) is affected, which is a core Windows component used to install and manage Microsoft Store and AppX packages. A flaw in how it handles hard links allows a local user with limited privileges to gain higher, system-level privileges on the affected computer.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Timeline

1. Apr 9, 2019, 8:18 PM UTCCVE published
2. Mar 15, 2022Added to CISA KEV

   CISA has evidence of exploitation in the wild

3. Apr 5, 2022CISA remediation deadline

   Due date for US federal agencies to patch

4. Oct 21, 2025, 11:45 PM UTCRecord last updated
5. Oct 22, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• Microsoft 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

• Microsoft Windows Server

  version 1709 (Core Installation), version 1803 (Core Installation), 2019, 2019 (Core installation)

References 8