---
title: "CVE-2020-1040: Improper Input Validation | CubePath"
description: "A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user…"
language: en
source: https://cubepath.com/security/cve/CVE-2020-1040
---

# CVE-2020-1040: Improper Input Validation | CubePath

## Description

A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system, aka 'Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2020-1032, CVE-2020-1036, CVE-2020-1041, CVE-2020-1042, CVE-2020-1043.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-1040)

## Key data

### CVSS 3.1 Critical 9.0

Score published by CISA-ADP in the CVE record.

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

| Metric                 | Value    | What it means                                                                         |
| ---------------------- | -------- | ------------------------------------------------------------------------------------- |
| Attack vector          | Adjacent | The attacker needs to be on the same shared network segment or a closely related one. |
| Attack complexity      | Low      | No special conditions are needed. The attack can be repeated at will.                 |
| Privileges required    | Low      | A basic user account is needed.                                                       |
| User interaction       | None     | No action from any user is needed.                                                    |
| Scope                  | Changed  | The impact can reach other components beyond the vulnerable one.                      |
| Confidentiality impact | High     | Serious or total effect on the secrecy of data.                                       |
| Integrity impact       | High     | Serious or total effect on the trustworthiness of data.                               |
| Availability impact    | High     | Serious or total effect on availability.                                              |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.07558 (7.6% probability)

Percentile

94.6%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

Microsoft Hyper-V RemoteFX vGPU Remote Code Execution Vulnerability

Added to the catalog

Nov 3, 2021

Federal due date

May 3, 2022

### CISA assessment as of Feb 4, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

no

Technical impact

total

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-20](https://cwe.mitre.org/data/definitions/20.html) Improper Input Validation

## Affected products

Products listed in the CVE record, as the CNA published them.

- Microsoft Windows Server

  - affected: 2016
  - affected: 2016 (Core installation)
  - affected: 2008 R2 for x64-based Systems Service Pack 1
  - affected: 2008 R2 for x64-based Systems Service Pack 1 (Core installation)
  - affected: 2012
  - affected: 2012 (Core installation)
  - affected: 2012 R2
  - affected: 2012 R2 (Core installation)

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [portal.msrc.microsoft.com/en-US/security-guidance/advisory/…](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1040)
- [nvidia.custhelp.com/app/answers/detail/a\_id/5044](https://nvidia.custhelp.com/app/answers/detail/a%5Fid/5044)

## Timeline

1. ID reserved Nov 4, 2019
2. Record published Jul 14, 2020
3. Added to CISA KEV Nov 3, 2021
4. Record last updated Oct 21, 2025

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:35 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)