CVE-2017-0021

Severity: critical (CVSS 9.0 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-03-17 · updated 2026-06-17

Description

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.

Affected products

Microsoft Windows 10 Version 1607: 1607
Microsoft Windows Server 2016: all versions
Microsoft Corporation Hyper-V vSMB: Hyper-V in Microsoft Windows 10 1607 and Windows Server 2016

References

http://www.securityfocus.com/bid/96020
http://www.securitytracker.com/id/1037999
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0021
http://www.securityfocus.com/bid/96020
http://www.securitytracker.com/id/1037999
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0021

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