# KB3188743: October 2016 security update

KB3188743, released October 11, 2016, fixes 1 CVE across 4 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/microsoft/kb3188743
- Platform: Microsoft
- Released: Oct 11, 2016
- Priority: High (Closes CVE-2016-3209, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/3188743

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft .NET Framework 3.5 on Windows 8.1 for 32-bit systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-8.1-for-32-bit-systems.md) |  |  |
| [Microsoft .NET Framework 3.5 on Windows 8.1 for x64-based systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-8.1-for-x64-based-systems.md) |  |  |
| [Microsoft .NET Framework 3.5 on Windows Server 2012 R2](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-server-2012-r2.md) |  |  |
| [Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-server-2012-r2-server-core-installation.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2016-3209](https://patchblox.com/security/data/cve/CVE-2016-3209.md) | High | Microsoft Graphics Component | n/a | 0.5365 |  |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo