# KB4471391: February 2019 security update

KB4471391, released February 12, 2019, fixes 2 CVEs in Microsoft Exchange Server 2019 Cumulative Update 1. 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/kb4471391
- Platform: Microsoft
- Released: Feb 12, 2019
- Priority: Urgent (Closes CVE-2019-0686, exploitation more likely)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4471391

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [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-2019-0686](https://patchblox.com/security/data/cve/CVE-2019-0686.md) | Urgent | Microsoft Exchange Server | n/a | 0.0503 | Disclosed |
| [CVE-2019-0724](https://patchblox.com/security/data/cve/CVE-2019-0724.md) | High | Microsoft Exchange Server | n/a | 0.2380 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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