# KB4484270: March 2020 security update

KB4484270, released March 10, 2020, fixes 3 CVEs in Microsoft Office Online Server. 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/kb4484270
- Platform: Microsoft
- Released: Mar 10, 2020
- Priority: Urgent (Closes CVE-2020-0852, rated Critical)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4484270

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Office Online Server](https://patchblox.com/security/data/product/microsoft/microsoft-office-online-server.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-0852](https://patchblox.com/security/data/cve/CVE-2020-0852.md) | Urgent | Microsoft Office | n/a | 0.1196 |  |
| [CVE-2020-0892](https://patchblox.com/security/data/cve/CVE-2020-0892.md) | High | Microsoft Office | n/a | 0.1183 |  |
| [CVE-2020-0850](https://patchblox.com/security/data/cve/CVE-2020-0850.md) | High | Microsoft Office | n/a | 0.0882 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo