# KB4475579: September 2019 security update

KB4475579, released September 10, 2019, fixes 2 CVEs across 2 products. One of them is being exploited (CVE-2019-1297); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/microsoft/kb4475579
- Platform: Microsoft
- Released: Sep 10, 2019
- Priority: Patch now (Closes CVE-2019-1297, exploited (CISA KEV))
- CVEs: 2, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://support.microsoft.com/help/4475579

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Excel 2016 (32-bit edition)](https://patchblox.com/security/data/product/microsoft/microsoft-excel-2016-32-bit-edition.md) |  |  |
| [Microsoft Excel 2016 (64-bit edition)](https://patchblox.com/security/data/product/microsoft/microsoft-excel-2016-64-bit-edition.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2019-1297](https://patchblox.com/security/data/cve/CVE-2019-1297.md) | Patch now | Microsoft Office | n/a | 0.2181 | CISA KEV |
| [CVE-2019-1263](https://patchblox.com/security/data/cve/CVE-2019-1263.md) | High | Microsoft Office | n/a | 0.0777 |  |

---

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo