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CVE-2020-0951

MEDIUMCVSS 6.7/10EPSS 7.04%

Last modified

CVE-2020-0951 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. <p>A security feature bypass vulnerability exists in Windows Defender Application Control (WDAC) which could allow an attacker to bypass WDAC enforcement. An attacker who successfully exploited this vulnerability could execute PowerShell commands that would be blocked by WDAC.</p> <p>To exploit the vulnerability, an attacker need administrator access on a local machine where PowerShell is running. EPSS estimates a 7.04% chance of exploitation in the next 30 days.

Description

<p>A security feature bypass vulnerability exists in Windows Defender Application Control (WDAC) which could allow an attacker to bypass WDAC enforcement. An attacker who successfully exploited this vulnerability could execute PowerShell commands that would be blocked by WDAC.</p> <p>To exploit the vulnerability, an attacker need administrator access on a local machine where PowerShell is running. The attacker could then connect to a PowerShell session and send commands to execute arbitrary code.</p> <p>The update addresses the vulnerability by correcting how PowerShell commands are validated when WDAC protection is enabled.</p>

Metrics

CVSS 3.1
6.7/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
7.04%

93.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
MicrosoftPowershell>= 7.0, < 7.0.8
MicrosoftPowershell>= 7.1, < 7.1.5
MicrosoftPowershell7.0.8
MicrosoftWindows 101607
MicrosoftWindows 101709
MicrosoftWindows 101803
MicrosoftWindows 101809
MicrosoftWindows 101903
MicrosoftWindows 101909
MicrosoftWindows 102004
MicrosoftWindows Server 2016All versions
MicrosoftWindows Server 20161903
MicrosoftWindows Server 20161909
MicrosoftWindows Server 20162004
MicrosoftWindows Server 2019All versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-0951?
<p>A security feature bypass vulnerability exists in Windows Defender Application Control (WDAC) which could allow an attacker to bypass WDAC enforcement. An attacker who successfully exploited this vulnerability could execute PowerShell commands that would be blocked by WDAC.</p> <p>To exploit the vulnerability, an attacker need administrator access on a local machine where PowerShell is running. The attacker could then connect to a PowerShell session and send commands to execute arbitrary code.</p> <p>The update addresses the vulnerability by correcting how PowerShell commands are validated when WDAC protection is enabled.</p>
How severe is CVE-2020-0951?
CVE-2020-0951 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 7.04% probability of exploitation in the next 30 days.
How do I fix CVE-2020-0951?
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-2020-0951?

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

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Source: NVD / NIST