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CVE-2017-0021

9.0 · CRITICAL

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 S…

Published Mar 17, 2017EPSS 1.71%

Overview

CVE-2017-0021 is a critical-severity vulnerability. It was published on March 17, 2017 and has a CVSS 3.0 base score of 9.0 (CRITICAL).

This vulnerability has a CVSS 3.0 base score of 9.0, rated CRITICAL. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/96020Refwww.securitytracker.com/id/1037999Refportal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0021Refwww.securityfocus.com/bid/96020Refwww.securitytracker.com/id/1037999Refportal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-0021

How CyberStrike helps

Frequently asked questions

What is CVE-2017-0021?

CVE-2017-0021 is a critical-severity vulnerability. It was published on March 17, 2017 and has a CVSS 3.0 base score of 9.0 (CRITICAL).

How severe is CVE-2017-0021?

This vulnerability has a CVSS 3.0 base score of 9.0, rated CRITICAL. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2017-0021?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-0021?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-0021 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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