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Windows Update Assistant

CVE-2021-26431 — Windows Recovery Environment Agent Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.01097 2021-08 archive

Executive Summary

None

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Aug 10 2021
Last Updated Aug 10 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.01097 — 0.61287 percentile
NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.8

EPSS Score

0.01097
probability of exploitation in the next 30 days
0.61287 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

11 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 2004 for 32-bit Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for ARM64-based Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for x64-based Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 20H2 for 32-bit Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 20H2 for ARM64-based Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 20H2 for x64-based Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 21H1 for 32-bit Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 21H1 for ARM64-based Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 21H1 for x64-based Systems 5005033 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 2004 (Server Core installation) 5005033 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 20H2 (Server Core Installation) 5005033 (Security Update) Important Elevation of Privilege Yes

Patches

1 patch
Article Type Restart
5005033 Security Update Yes

Known Exploits

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