# KB4499405: May 2019 security update

KB4499405, released May 14, 2019, fixes 4 CVEs across 12 products. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4499405
- Platform: Microsoft
- Released: May 14, 2019
- Priority: High (Closes CVE-2019-0820, high severity)
- CVEs: 4, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4499405

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft .NET Framework 3.5 on Windows 10 Version 1809 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-10-version-1809-for-32-bit-systems.md) |  |  |
| [Microsoft .NET Framework 3.5 on Windows 10 Version 1809 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-10-version-1809-for-x64-based-systems.md) |  |  |
| [Microsoft .NET Framework 3.5 on Windows Server 2019](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-server-2019.md) |  |  |
| [Microsoft .NET Framework 3.5 on Windows Server 2019  (Server Core installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-on-windows-server-2019-server-core-installation.md) |  |  |
| [Microsoft .NET Framework 4.7.2 on Windows 10 Version 1809 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.7.2-on-windows-10-version-1809-for-32-bit-systems.md) |  |  |
| [Microsoft .NET Framework 4.7.2 on Windows 10 Version 1809 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.7.2-on-windows-10-version-1809-for-x64-based-systems.md) |  |  |
| [Microsoft .NET Framework 4.7.2 on Windows Server 2019](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.7.2-on-windows-server-2019.md) |  |  |
| [Microsoft .NET Framework 4.7.2 on Windows Server 2019  (Server Core installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.7.2-on-windows-server-2019-server-core-installation.md) |  |  |
| [Microsoft .NET Framework 4.8 on Windows 10 Version 1809 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.8-on-windows-10-version-1809-for-32-bit-systems.md) |  |  |
| [Microsoft .NET Framework 4.8 on Windows 10 Version 1809 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.8-on-windows-10-version-1809-for-x64-based-systems.md) |  |  |
| [Microsoft .NET Framework 4.8 on Windows Server 2019](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.8-on-windows-server-2019.md) |  |  |
| [Microsoft .NET Framework 4.8 on Windows Server 2019 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-4.8-on-windows-server-2019-server-core-installation.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2019-0820](https://patchblox.com/security/data/cve/CVE-2019-0820.md) | High | .NET Framework | 7.5 | 0.0572 |  |
| [CVE-2019-0980](https://patchblox.com/security/data/cve/CVE-2019-0980.md) | High | .NET Core | 7.5 | 0.0498 |  |
| [CVE-2019-0981](https://patchblox.com/security/data/cve/CVE-2019-0981.md) | High | .NET Core | 7.5 | 0.0498 |  |
| [CVE-2019-0864](https://patchblox.com/security/data/cve/CVE-2019-0864.md) | High | .NET Framework | n/a | 0.0135 |  |

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Data as of 2026-11-07T12:40:37Z 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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