Review reviewHigh

CVE-2026-42987

Microsoft Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2

Use after free in Windows Deployment Services 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 probability0.59%

Technical severityCVSS 8.1

Use after free in Windows Deployment Services allows an unauthorized attacker to execute code over a network.

Product: Microsoft Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2
Affected versions: >= 6.2.9200.0 < 6.2.9200.26132, >= 6.3.9600.0 < 6.3.9600.23228, >= 10.0.14393.0 < 10.0.14393.9234, >= 10.0.17763.0 < 10.0.17763.8880, >= 10.0.20348.0 < 10.0.20348.5256, >= 10.0.26100.0 < 10.0.26100.32995, r2, < 10.0.14393.9234, < 10.0.17763.8880, < 10.0.20348.5256, < 10.0.26100.32995
Fixed versions: 10.0.14393.9234, 10.0.17763.8880, 10.0.20348.5256, 10.0.26100.32995

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2 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.