# KB4584787: January 2021 security update

KB4584787, released January 12, 2021, fixes 2 CVEs in Microsoft Visual Studio 2015 Update 3. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4584787
- Platform: Microsoft
- Released: Jan 12, 2021
- Priority: High (Closes CVE-2021-1651, high severity)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4584787

## 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-2021-1651](https://patchblox.com/security/data/cve/CVE-2021-1651.md) | High | Windows Diagnostic Hub | 7.8 | 0.0082 |  |
| [CVE-2021-1680](https://patchblox.com/security/data/cve/CVE-2021-1680.md) | High | Windows Diagnostic Hub | 7.8 | 0.0073 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo