CVE-2018-8221

Name: CVE-2018-8221
Creator: NVD / NIST
Published: 2018-06-14T12:29:01.633+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.98%

Last modified Jun 17, 2026

CVE-2018-8221 is a vulnerability of currently unknown severity. A security feature bypass vulnerability exists in Device Guard that could allow an attacker to inject malicious code into a Windows PowerShell session, aka "Device Guard Code Integrity Policy Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8201, CVE-2018-8211, CVE-2018-8212, CVE-2018-8215, CVE-2018-8216, CVE-2018-8217.. EPSS estimates a 1.98% chance of exploitation in the next 30 days.

Description

A security feature bypass vulnerability exists in Device Guard that could allow an attacker to inject malicious code into a Windows PowerShell session, aka "Device Guard Code Integrity Policy Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8201, CVE-2018-8211, CVE-2018-8212, CVE-2018-8215, CVE-2018-8216, CVE-2018-8217.

Metrics

EPSS Probability

1.98%

78.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10	All versions
Microsoft	Windows 10	1607
Microsoft	Windows 10	1703
Microsoft	Windows 10	1709
Microsoft	Windows 10	1803
Microsoft	Windows Server 2016	All versions
Microsoft	Windows Server 2016	1709
Microsoft	Windows Server 2016	1803

References

http://www.securityfocus.com/bid/104338Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041098Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8221Mitigation, Patch, Vendor Advisory
http://www.securityfocus.com/bid/104338Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1041098Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8221Mitigation, Patch, Vendor Advisory

Timeline

Published: Jun 14, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-8221?

How severe is CVE-2018-8221?

Severity scoring for CVE-2018-8221 is pending analysis. The EPSS model estimates a 1.98% probability of exploitation in the next 30 days.

How do I fix CVE-2018-8221?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-8221?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST