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Microsoft PowerShell

CVE-2021-43896 — Microsoft PowerShell Spoofing Vulnerability

Important CVSS 5.5 EPSS 0.0232 2021-12 archive

Executive Summary

None

Overview

5.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Spoofing
Released Dec 14 2021
Last Updated Dec 14 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.0232 — 0.81228 percentile
NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
High
AVAILABILITY
None
Temporal Score: 5.5

EPSS Score

0.0232
probability of exploitation in the next 30 days
0.81228 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

3 affected products
Product KB Article Severity Impact Restart Required
CBL Mariner 1.0 ARM powershell (CBL-Mariner) Unknown Unknown Unknown
CBL Mariner 1.0 x64 powershell (CBL-Mariner) Unknown Unknown Unknown
CBL Mariner 2.0 ARM Unknown Unknown None Base: 5.5 Temporal: 5.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Unknown Unknown None CBL Mariner 2.0 x64 Unknown Unknown None Base: 5.5 Temporal: 5.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N Unknown Unknown None PowerShell 7.2 Release Notes (Security Update) Important Spoofing Maybe

Patches

2 patches
Article Type Restart
powershell CBL-Mariner Unknown
Release Notes Security Update Maybe

Known Exploits

Acknowledgments

Young Min Kim of CompSec Lab at Seoul National University

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