Though Microsoft released a number of security patches in its July 11 update (on formerly-and-still-somewhat-known-as Patch Tuesday), there were a number of out-of-band updates also released on July 27. This update applies to vulnerabilities specifically Outlook and Office Click-to-run.
Several of the vulnerabilities in the late July update prevent remote code executions (RCE) in Outlook 2007, 2010, 2013 and 2016, as well as Office 2010 and 2016 Click-To-Run.
“This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file,” writes Microsoft in their security update.
