# CVE-2017-0129: Microsoft Lync for Mac Certificate Validation Vulnerability

CVE-2017-0129 is fixed in Microsoft Lync for Mac 2011 on 1 platform by KB4012487 (version ), released March 14, 2017. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2017-0129
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0795
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: N/A
- Published: Mar 14, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-0129

## Description

<p>A security feature bypass exists when the Lync for Mac 2011 client fails to properly validate certificates. An attacker who successfully exploited this vulnerability could tamper with trusted communications between the server and target client.</p> <p>To exploit the vulnerability, an attacker would need to intercept and tamper with network traffic.</p> <p>The security update addresses the vulnerability by correcting how the Lync for Mac 2011 client validates certificates.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Lync for Mac 2011 |  | [KB4012487](https://patchblox.com/security/data/fix/microsoft/kb4012487.md) | Mar 14, 2017 |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo