# CVE-2025-2884: Cert CC: CVE-2025-2884 Out-of-Bounds read vulnerability in TCG TPM2.0 reference implementation

CVE-2025-2884 is fixed in 7 products on 1 platform, first by KB5066793, released October 14, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-2884
- Priority: Routine
- CVSS: 5.3 (Important)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 14, 2025
- Weakness: Out-of-bounds Read
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-2884

## Description

<p><a href="https://www.cve.org/CVERecord?id=CVE-2025-2884">CVE-2025-2884</a> is regarding a vulnerability in TCG TPM2.0 Reference implementation's CryptHmacSign helper function that is vulnerable to Out-of-Bounds read due to the lack of validation the signature scheme with the signature key's algorithm.</p> <p>CERT/CC created this CVE on their behalf. The documented Windows updates incorporate updates in TCG TPM2.0 Reference implementation which address this vulnerability. Please see <a href="https://www.cve.org/CVERecord?id=CVE-2025-2884">CVE-2025-2884</a> for more information.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 11 Version 22H2 for x64-based Systems |  | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems |  | [KB5066793](https://patchblox.com/security/data/fix/microsoft/kb5066793.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows 11 Version 25H2 for x64-based Systems |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 25398.1913 | [KB5066780](https://patchblox.com/security/data/fix/microsoft/kb5066780.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2025 |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |
| Microsoft | Windows Server 2025 (Server Core installation) |  | [KB5066835](https://patchblox.com/security/data/fix/microsoft/kb5066835.md) | Oct 14, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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