CVE-2025-27472
Medium CVSS 5.4Published 2025-04-08 ยท last changed 2026-06-17
The fix
Microsoft fixes this in updatesKB5055547, KB5055581, KB5055557. 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 10 for 32-bit Systems | 10.0.10240.20978 | KB5055547 | 2026-09-17 |
| Windows 10 for x64-based Systems | 10.0.10240.20978 | KB5055547 | 2026-09-17 |
| Windows Server 2012 | 6.2.9200.25423 | KB5055581 | 2026-09-17 |
| Windows Server 2012 R2 | 6.3.9600.22523 | KB5055557 | 2026-09-17 |
| Windows Server 2012 R2 (Server Core installation) | 6.3.9600.22523 | KB5055557 | 2026-09-17 |
| Windows Server 2012 (Server Core installation) | 6.2.9200.25423 | KB5055581 | 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
Protection mechanism failure in Windows Mark of the Web (MOTW) allows an unauthorized attacker to bypass a security feature over a network.
Sources
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L