# KB4509409: July 2019 security update

KB4509409, released July 9, 2019, fixes 3 CVEs across 3 products. 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/kb4509409
- Platform: Microsoft
- Released: Jul 9, 2019
- Priority: High (Closes CVE-2019-1084, high severity)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4509409

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2013 Cumulative Update 23](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2013-cumulative-update-23.md) |  |  |
| [Microsoft Exchange Server 2016 Cumulative Update 12](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2016-cumulative-update-12.md) |  |  |
| [Microsoft Exchange Server 2016 Cumulative Update 13](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2016-cumulative-update-13.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2019-1084](https://patchblox.com/security/data/cve/CVE-2019-1084.md) | High | Microsoft Office | n/a | 0.0533 |  |
| [CVE-2019-1136](https://patchblox.com/security/data/cve/CVE-2019-1136.md) | High | Microsoft Exchange Server | n/a | 0.0338 |  |
| [CVE-2019-1137](https://patchblox.com/security/data/cve/CVE-2019-1137.md) | High | Microsoft Exchange Server | n/a | 0.0158 |  |

---

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo