# KB4493138: December 2020 security update

KB4493138, released December 8, 2020, fixes 5 CVEs in Microsoft SharePoint Foundation 2013 Service Pack 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/kb4493138
- Platform: Microsoft
- Released: Dec 8, 2020
- Priority: Urgent (Closes CVE-2020-17118, exploitation more likely)
- CVEs: 5, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4493138

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft SharePoint Foundation 2013 Service Pack 1](https://patchblox.com/security/data/product/microsoft/microsoft-sharepoint-foundation-2013-service-pack-1.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-17118](https://patchblox.com/security/data/cve/CVE-2020-17118.md) | Urgent | Microsoft Office SharePoint | 8.1 | 0.0379 | More likely |
| [CVE-2020-17121](https://patchblox.com/security/data/cve/CVE-2020-17121.md) | Urgent | Microsoft Office SharePoint | 8.8 | 0.0305 | More likely |
| [CVE-2020-17089](https://patchblox.com/security/data/cve/CVE-2020-17089.md) | High | Microsoft Office SharePoint | 7.1 | 0.0289 |  |
| [CVE-2020-17115](https://patchblox.com/security/data/cve/CVE-2020-17115.md) | High | Microsoft Office SharePoint | 8.0 | 0.0268 |  |
| [CVE-2020-17120](https://patchblox.com/security/data/cve/CVE-2020-17120.md) | Routine | Microsoft Office SharePoint | 5.3 | 0.0310 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo