CVE-2019-1029: Microsoft Lync Server

Medium severity, CVSS 5.9. EPSS: 5.3% chance of exploitation in the next 30 days.

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. To exploit the vulnerability, an attacker needs to obtain a dial-in link for a vulnerable server and then initiates a series of calls within a short amount of time. The update addresses the vulnerability by correcting the way that Skype for Business server handles objects in memory.

Affected products

• Microsoft Lync Server: version 2010 only; version 2013 only

Published 2019-06-12. Last modified 2026-06-17.