# KB4020734: June 2017 security update

KB4020734, released June 13, 2017, fixes 1 CVE in Microsoft Lync 2010 Attendee (user level install). 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/kb4020734
- Platform: Microsoft
- Released: Jun 13, 2017
- Priority: Urgent (Closes CVE-2017-0283, rated Critical)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4020734

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Lync 2010 Attendee (user level install)](https://patchblox.com/security/data/product/microsoft/microsoft-lync-2010-attendee-user-level-install.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2017-0283](https://patchblox.com/security/data/cve/CVE-2017-0283.md) | Urgent | Microsoft Uniscribe | 8.8 | 0.3902 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo