# CVE-2020-1595: Microsoft SharePoint Remote Code Execution Vulnerability

CVE-2020-1595 is fixed in 4 products on 1 platform, first by KB4484515, released September 8, 2020. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2020-1595
- Priority: Urgent
- CVSS: 9.9 (Critical)
- EPSS: 0.0198
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Sep 8, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1595

## Description

<p>A remote code execution vulnerability exists in Microsoft SharePoint where APIs aren't properly protected from unsafe data input. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account.</p> <p>Exploitation of this vulnerability requires that a user access a susceptible API on an affected version of SharePoint with specially-formatted input.</p> <p>The security update addresses the vulnerability by correcting how SharePoint handles deserialization of untrusted data.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2013 Service Pack 1 |  | [KB4484515](https://patchblox.com/security/data/fix/microsoft/kb4484515.md) | Sep 8, 2020 |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 |  | [KB4484506](https://patchblox.com/security/data/fix/microsoft/kb4484506.md) | Sep 8, 2020 |
| Microsoft | Microsoft SharePoint Foundation 2013 Service Pack 1 |  | [KB4484525](https://patchblox.com/security/data/fix/microsoft/kb4484525.md) | Sep 8, 2020 |
| Microsoft | Microsoft SharePoint Server 2019 |  | [KB4484505](https://patchblox.com/security/data/fix/microsoft/kb4484505.md) | Sep 8, 2020 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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