# KB4571787: February 2021 security update

KB4571787, released February 9, 2021, fixes 1 CVE in Microsoft Exchange Server 2019 Cumulative Update 7. None of them is reported as exploited. Patch Radar priority: Routine. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4571787
- Platform: Microsoft
- Released: Feb 9, 2021
- Priority: Routine (Closes CVE-2021-1730)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4571787

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2019 Cumulative Update 7](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2019-cumulative-update-7.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-1730](https://patchblox.com/security/data/cve/CVE-2021-1730.md) | Routine | Microsoft Exchange Server | 5.4 | 0.0182 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo