What’s Vulnerable › Vulnerabilities

CVE-2021-43896: Microsoft PowerShell Spoofing Vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-15 · updated 2026-06-17

Description

Microsoft PowerShell Spoofing Vulnerability

Affected products

• Microsoft Powershell: from 7.2 before 7.2.1 — fixed in 7.2.1
• Microsoft CBL Mariner 1.0 ARM: from 1.0 before 7.2.1-1 — fixed in 7.2.1-1
• Microsoft CBL Mariner 1.0 x64: from 1.0 before 7.2.1-1 — fixed in 7.2.1-1
• Microsoft CBL Mariner 2.0 ARM: all versions
• Microsoft CBL Mariner 2.0 x64: all versions
• Microsoft PowerShell 7.2: from 7.2.0 before 7.2.1 — fixed in 7.2.1

How to fix

Upgrade to a fixed version: Microsoft Powershell 7.2.1; Microsoft CBL Mariner 1.0 ARM 7.2.1-1; Microsoft CBL Mariner 1.0 x64 7.2.1-1; Microsoft PowerShell 7.2 7.2.1. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43896
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43896

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