CVE-2025-21370
High CVSS 7.8Published 2025-01-14 ยท last changed 2026-06-17
The fix
Microsoft fixes this in updatesKB5050021, KB5050009. The fixed build differs per Windows version, so the row that matters is the one matching the machine you are looking at.
| Windows version | Fixed in build | Update | Released |
|---|---|---|---|
| Windows 11 Version 22H2 for ARM64-based Systems | 10.0.22621.4751 | KB5050021 | 2026-09-17 |
| Windows 11 Version 22H2 for x64-based Systems | 10.0.22621.4751 | KB5050021 | 2026-09-17 |
| Windows 11 Version 23H2 for ARM64-based Systems | 10.0.22631.4751 | KB5050021 | 2026-09-17 |
| Windows 11 Version 23H2 for x64-based Systems | 10.0.22631.4751 | KB5050021 | 2026-09-17 |
| Windows 11 Version 24H2 for ARM64-based Systems | 10.0.26100.2894 | KB5050009 | 2026-09-17 |
| Windows 11 Version 24H2 for x64-based Systems | 10.0.26100.2894 | KB5050009 | 2026-09-17 |
Having the KB is not the same as knowing whether a machine has it. Windows updates supersede each other, so the update you installed often covers a fix that shipped in an earlier one. Paste your build into the patch checker and it walks that chain for you.
What it is
Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability
Sources
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H