THREATPORT/VULNERABILITY/CVE-2020-0951
MEDIUM SEVERITY

CVE-2020-0951

Powershell vulnerability

CVSS
6.7
EPSS
7.0%
EPSS pct
94th
Exploited
No known
<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>
Affected vendor
Microsoft
Affected product
Powershell
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published
2020-09-11

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring high privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 7.0% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2020-0951

  • Confirm whether Microsoft Powershell is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2020-0951.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2020-0951

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