Review reviewHigh

CVE-2026-42993

Microsoft Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.43%

Technical severityCVSS 7.5

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Product: Microsoft Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2
Affected versions: >= 10.0.19044.0 < 10.0.19044.7417, >= 10.0.19045.0 < 10.0.19045.7417, >= 10.0.22631.0 < 10.0.22631.7219, >= 10.0.26100.0 < 10.0.26100.8655, >= 10.0.26200.0 < 10.0.26200.8655, >= 10.0.28000.0 < 10.0.28000.2269, >= 10.0.20348.0 < 10.0.20348.5256, >= 10.0.26100.0 < 10.0.26100.32995, < 10.0.19044.7417, < 10.0.19045.7417, < 10.0.22631.7219, < 10.0.26100.8655, < 10.0.26200.8655, < 10.0.28000.2269, < 10.0.20348.5256, < 10.0.26100.32995
Fixed versions: 10.0.19044.7417, 10.0.19045.7417, 10.0.22631.7219, 10.0.26100.8655, 10.0.26200.8655, 10.0.28000.2269, 10.0.20348.5256, 10.0.26100.32995

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2 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.