# KB4571481: September 2020 security update

KB4571481, released September 8, 2020, fixes 2 CVEs in Microsoft Visual Studio 2015 Update 3. 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/kb4571481
- Platform: Microsoft
- Released: Sep 8, 2020
- Priority: Urgent (Closes CVE-2020-16874, rated Critical)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4571481

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Visual Studio 2015 Update 3](https://patchblox.com/security/data/product/microsoft/microsoft-visual-studio-2015-update-3.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-16874](https://patchblox.com/security/data/cve/CVE-2020-16874.md) | Urgent | Visual Studio | 7.8 | 0.0429 |  |
| [CVE-2020-16856](https://patchblox.com/security/data/cve/CVE-2020-16856.md) | High | Visual Studio | 7.8 | 0.0437 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo