# KB4487563: April 2019 security update

KB4487563, released April 9, 2019, fixes 2 CVEs across 5 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/kb4487563
- Platform: Microsoft
- Released: Apr 9, 2019
- Priority: High (Closes CVE-2019-0817, high severity)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4487563

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2013 Cumulative Update 22](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2013-cumulative-update-22.md) |  |  |
| [Microsoft Exchange Server 2016 Cumulative Update 11](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2016-cumulative-update-11.md) |  |  |
| [Microsoft Exchange Server 2016 Cumulative Update 12](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2016-cumulative-update-12.md) |  |  |
| [Microsoft Exchange Server 2019](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2019.md) |  |  |
| [Microsoft Exchange Server 2019 Cumulative Update 1](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2019-cumulative-update-1.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2019-0817](https://patchblox.com/security/data/cve/CVE-2019-0817.md) | High | Microsoft Exchange Server | n/a | 0.0229 |  |
| [CVE-2019-0858](https://patchblox.com/security/data/cve/CVE-2019-0858.md) | High | Microsoft Exchange Server | n/a | 0.0210 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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