# CVE-2020-1040: Microsoft Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability

Source: https://junglewise.ai/threats/cve-2020-1040-microsoft-hyper-v-remotefx-vgpu-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2020-1040 · Severity: critical · CVSS 9 · Exploited in the wild · Published 2021-11-03

Microsoft Hyper-V RemoteFX vGPU contains an improper input validation vulnerability where the host server fails to properly validate input from an authenticated user on a guest operating system. Successful exploitation allows an attacker to escape the guest VM and execute arbitrary code on the host operating system.

Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2020-1040 exploited in the wild?** Yes. CVE-2020-1040 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2020-1040?** Critical severity, with a CVSS score of 9, published 3 November 2021.

**Which products and versions are affected?** Microsoft Windows Server 2008 R2 x64; Microsoft Windows Server 2012; Microsoft Windows Server 2012 R2; Microsoft Windows Server 2016.

**Is there a fix for CVE-2020-1040?** A patch was published on 2020-07-14: MSRC advisory and patch released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2020-1040 attacked?** It is attacked from the adjacent network, in an operating system.

**Am I affected by CVE-2020-1040?** Check whether you run Microsoft Hyper-V Remotefx. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Microsoft Windows Server 2008 R2 x64
- Microsoft Windows Server 2012
- Microsoft Windows Server 2012 R2
- Microsoft Windows Server 2016

## Timeline

- 2020-07-14: disclosed: NVD Published Date
- 2020-07-14: patched: MSRC advisory and patch released
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2021-11-03: exploited: Confirmed exploited in the wild per CISA KEV entry