CVE-2021-26422: Microsoft Lync Server

High severity, CVSS 7.2. EPSS: 2.2% chance of exploitation in the next 30 days.

Skype for Business and Lync Remote Code Execution Vulnerability

Affected products

• Microsoft Lync Server: version 2013 only
• Microsoft Skype For Business Server: version 2015 only; version 2019 only

Published 2021-05-11. Last modified 2026-06-17.