# CVE-2021-34517: Microsoft SharePoint Server Spoofing Vulnerability

CVE-2021-34517 is fixed in 4 products on 1 platform, first by KB5001984, released July 13, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-34517
- Priority: Routine
- CVSS: 5.3 (Important)
- EPSS: 0.0197
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jul 13, 2021
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34517

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2013 Service Pack 1 |  | [KB5001984](https://patchblox.com/security/data/fix/microsoft/kb5001984.md) | Jul 13, 2021 |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 |  | [KB5001976](https://patchblox.com/security/data/fix/microsoft/kb5001976.md) | Jul 13, 2021 |
| Microsoft | Microsoft SharePoint Foundation 2013 Service Pack 1 |  | [KB5001992](https://patchblox.com/security/data/fix/microsoft/kb5001992.md) | Jul 13, 2021 |
| Microsoft | Microsoft SharePoint Server 2019 |  | [KB5001975](https://patchblox.com/security/data/fix/microsoft/kb5001975.md) | Jul 13, 2021 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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