CVE-2025-55697
High CVSS 7.8Published 2025-10-14 ยท last changed 2026-06-17
The fix
Microsoft fixes this in updatesKB5066780, KB5066835. 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 Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.1913 | KB5066780 | 2026-09-19 |
| Windows Server 2025 | 10.0.26100.6899 | KB5066835 | 2026-09-19 |
| Windows Server 2025 (Server Core installation) | 10.0.26100.6899 | KB5066835 | 2026-09-19 |
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
Heap-based buffer overflow in Azure Local allows an authorized attacker to elevate privileges locally.
Sources
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H