# CVE-2018-8546: Microsoft Skype for Business Denial of Service Vulnerability

CVE-2018-8546 is fixed in 8 products on 1 platform, first by KB4461487, released November 13, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-8546
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0546
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Unlikely
- Published: Nov 13, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8546

## Description

<p>A denial of service vulnerability exists in Skype for Business. An attacker who successfully exploited the vulnerability could cause Skype for Business to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate the attacker's user rights.</p> <p>For an attack to be successful, this vulnerability requires that a user sends a number of emojis in the affected version of Skype for Business.</p> <p>The security update addresses the vulnerability by correcting how Skype for Business handles emojis.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Lync 2013 Service Pack 1 (32-bit) |  | [KB4461487](https://patchblox.com/security/data/fix/microsoft/kb4461487.md) | Nov 13, 2018 |
| Microsoft | Microsoft Lync 2013 Service Pack 1 (64-bit) |  | [KB4461487](https://patchblox.com/security/data/fix/microsoft/kb4461487.md) | Nov 13, 2018 |
| Microsoft | Microsoft Lync Basic 2013 Service Pack 1 (32-bit) |  | [KB4461487](https://patchblox.com/security/data/fix/microsoft/kb4461487.md) | Nov 13, 2018 |
| Microsoft | Microsoft Lync Basic 2013 Service Pack 1 (64-bit) |  | [KB4461487](https://patchblox.com/security/data/fix/microsoft/kb4461487.md) | Nov 13, 2018 |
| Microsoft | Skype for Business 2016 (32-bit) |  | [KB4461473](https://patchblox.com/security/data/fix/microsoft/kb4461473.md) | Nov 13, 2018 |
| Microsoft | Skype for Business 2016 (64-bit) |  | [KB4461473](https://patchblox.com/security/data/fix/microsoft/kb4461473.md) | Nov 13, 2018 |
| Microsoft | Skype for Business 2016 Basic (32-bit) |  | [KB4461473](https://patchblox.com/security/data/fix/microsoft/kb4461473.md) | Nov 13, 2018 |
| Microsoft | Skype for Business 2016 Basic (64-bit) |  | [KB4461473](https://patchblox.com/security/data/fix/microsoft/kb4461473.md) | Nov 13, 2018 |

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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