# KB4506991: July 2019 security update

KB4506991, released July 9, 2019, fixes 3 CVEs across 3 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4506991
- Platform: Microsoft
- Released: Jul 9, 2019
- Priority: Urgent (Closes CVE-2019-1113, exploitation more likely)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4506991

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-1903-for-32-bit-systems.md) |  |  |
| [Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-1903-for-x64-based-systems.md) |  |  |
| [Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-server-version-1903-server-core-installation.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2019-1113](https://patchblox.com/security/data/cve/CVE-2019-1113.md) | Urgent | .NET Framework | n/a | 0.1000 | More likely |
| [CVE-2019-1083](https://patchblox.com/security/data/cve/CVE-2019-1083.md) | High | .NET Framework | n/a | 0.0780 |  |
| [CVE-2019-1006](https://patchblox.com/security/data/cve/CVE-2019-1006.md) | High | .NET Framework | n/a | 0.0607 |  |

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Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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