ReviewCritical

CVE-2026-62815

Microsoft Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2

Use after free in Microsoft QUIC 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 probability-

Technical severityCVSS 9.8

Use after free in Microsoft QUIC allows an unauthorized attacker to execute code over a network.

Product: Microsoft Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2
Affected versions: >= 10.0.22631.0 < 10.0.22631.7517, >= 10.0.26100.0 < 10.0.26100.9168, >= 10.0.26200.0 < 10.0.26200.9168, >= 10.0.28000.0 < 10.0.28000.2704, >= 10.0.20348.0 < 10.0.20348.5499, >= 10.0.26100.0 < 10.0.26100.33296, < 10.0.26100.9106, < 10.0.26200.9106, < 10.0.20348.5440, < 10.0.26100.33222
Fixed versions: Verify the fixed release separately for each affected product line

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2 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.