CVE-2025-2884
Medium CVSS 6.6Published 2025-06-10 ยท last changed 2026-08-11
The fix
Microsoft fixes this in updatesKB5066793, KB5066835, KB5077179, KB5066780. 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 x64-based Systems | 10.0.22621.6060 | KB5066793 | 2026-09-19 |
| Windows 11 Version 23H2 for x64-based Systems | 10.0.22631.6060 | KB5066793 | 2026-09-19 |
| Windows 11 Version 24H2 for x64-based Systems | 10.0.26100.6899 | KB5066835 | 2026-09-19 |
| Windows 11 Version 25H2 for x64-based Systems | 10.0.26200.6899 | KB5066835 | 2026-09-19 |
| Windows 11 version 26H1 for x64-based Systems | 10.0.28000.1575 | KB5077179 | 2026-09-19 |
| 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
TCG TPM2.0 Reference implementation's CryptHmacSign helper function is vulnerable to Out-of-Bounds read due to the lack of validation the signature scheme with the signature key's algorithm. See Errata Revision 1.83 and advisory TCGVRT0009 for TCG standard TPM2.0
Sources
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:H