How severe is CVE-2021-43896?

CVE-2021-43896 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-43896 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43896?

CVE-2021-43896 affects Microsoft Powershell. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43896?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-43896 published?

CVE-2021-43896 was published on 2021-12-15 and last updated on 2026-06-17.

CVE-2021-43896

CVE-2021-43896 is a medium-severity vulnerability in Microsoft Powershell with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Powershell
Published: 2021-12-15
Last modified: 2026-06-17

Description

Microsoft PowerShell Spoofing Vulnerability

Frequently asked questions

What is CVE-2021-43896?: Microsoft PowerShell Spoofing Vulnerability
How severe is CVE-2021-43896?: CVE-2021-43896 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-43896 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43896?: CVE-2021-43896 affects Microsoft Powershell. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43896?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-43896 published?: CVE-2021-43896 was published on 2021-12-15 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:microsoft:powershell:*:*:*:*:*:*:*:*

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