ReviewHigh

CVE-2021-42286

Microsoft Windows 10 Version 2004, Windows 10 Version 20H2, Windows 10 Version 21H1

Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.47%

Technical severityCVSS 7.8

Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability

Product: Microsoft Windows 10 Version 2004, Windows 10 Version 20H2, Windows 10 Version 21H1
Affected versions: >= 10.0.0 < 10.0.19041.1348, >= 10.0.0 < 10.0.19042.1348, >= 10.0.0 < 10.0.19043.1348, 20h2, 21h1, 2004
Fixed versions: No verified fixed-version field is available yet

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Windows 10 Version 2004, Windows 10 Version 20H2, Windows 10 Version 21H1 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.