# KB5002042: October 2021 security update

KB5002042, released October 12, 2021, fixes 3 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/kb5002042
- Platform: Microsoft
- Released: Oct 12, 2021
- Priority: Urgent (Closes CVE-2021-40487, exploitation more likely)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5002042

## 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-2021-40487](https://patchblox.com/security/data/cve/CVE-2021-40487.md) | Urgent | Microsoft Office SharePoint | 8.1 | 0.4821 | More likely |
| [CVE-2021-41344](https://patchblox.com/security/data/cve/CVE-2021-41344.md) | Urgent | Microsoft Office SharePoint | 8.1 | 0.0648 | More likely |
| [CVE-2021-40484](https://patchblox.com/security/data/cve/CVE-2021-40484.md) | High | Microsoft Office SharePoint | 7.6 | 0.0138 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo