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CVE-2017-0021: Windows 10 and Server 2016 Hyper-V can run malicious code

CVE-2017-0021 · published 9 years ago

Summary

The Hyper-V virtualization feature in Windows 10 version 1607 and Windows Server 2016 does not correctly check certain data packets, which could let an attacker run their own programs on the system. This could lead to unauthorized access or control of the computer. Install the latest security updates from Microsoft as soon as possible to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software

Vendor	Product	Affected versions
microsoft	windows_10	1607 `cpe:2.3:o:microsoft:windows_10:1607:::::::*`
microsoft	windows_server_2016	All versions `cpe:2.3:o:microsoft:windows_server_2016::::::::`

Original advisory text

Hyper-V in Microsoft Windows 10 1607 and Windows Server 2016 does not properly validate vSMB packet data, which allows attackers to execute arbitrary code on a target OS, aka "Hyper-V System Data Structure Vulnerability." This vulnerability is different from that described in CVE-2017-0095.

References

http://www.securityfocus.com/bid/96020 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1037999
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0021 Mitigation Patch Vendor Advisory

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker full control (estimated)

Severity

9.0 Critical

Exploitation

2% chance of attack within 30 days

Timeline

Published17 Mar 2017

Updated3 Nov 2026

First seen29 Sep 2026

Sources

CVE-2017-0021 · NVD

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