Critical 9.0Known exploited (CISA KEV)Published Jul 14, 2020

CVE-2020-1040A 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…

Updated under an hour ago (2026-10-19 09:00 UTC)

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It affects Microsoft Windows Server and 3 other products. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022. Treat that date as your deadline.

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Every CVE for Microsoft Windows Server

Exploited in the last 30 days

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.

CVSS: 9.0 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-20
Known exploited: Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022Apply updates per vendor instructions.
EPSS (exploitation in the next 30 days): 7.39% (percentile 94)
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Windows Server microsoft:windows_server (from the name)	2016; 2016 (Core installation); 2008 R2 for x64-based Systems Service Pack 1; 2008 R2 for x64-based Systems Service Pack 1 (Core installation); 2012; 2012 (Core installation); 2012 R2; 2012 R2 (Core installation)	CNA record
microsoft windows_server_2008 microsoft:windows_server_2008	r2	NVD
microsoft windows_server_2012 microsoft:windows_server_2012	all versions; r2	NVD
microsoft windows_server_2016 microsoft:windows_server_2016	all versions	NVD

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1040x-refsource-misc, patch, vendor-advisory
https://nvidia.custhelp.com/app/answers/detail/a_id/5044x-refsource-confirm, third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1040us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.