# KB4515509: September 2019 security update

KB4515509, released September 10, 2019, fixes 1 CVE in Microsoft Lync Server 2013. 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/kb4515509
- Platform: Microsoft
- Released: Sep 10, 2019
- Priority: High (Closes CVE-2019-1209, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4515509

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Lync Server 2013](https://patchblox.com/security/data/product/microsoft/microsoft-lync-server-2013.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2019-1209](https://patchblox.com/security/data/cve/CVE-2019-1209.md) | High | Skype for Business and Microsoft Lync | n/a | 0.0620 |  |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo