This security update resolves vulnerabilities in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2017-8509.
Note To apply this security update, you must have the release version of Office 2016 installed on the computer.
Improvements and fixes
- Increases the number of retries when trying to connect to a host in Microsoft Outlook 2016. By default, WinHTTP will try six IP addresses (one initial attempt and five retries) when trying to establish a connection to a host. If Outlook 2016 tries more than six IP addresses, the connection will fail. This is particularly problematic on networks that have intermittent IPv6 connectivity problems. Increasing the number of retries may allow the connection to succeed with IPv4 addresses. To enable this feature, see KB3178716 for more information.
Security update deployment information
For deployment information about this update, see security update deployment information: June 13, 2017.
Security update replacement information
This security update does not replace any previously released update.
File hash information
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How to get help and support for this security update
Help for installing updates: Windows Update FAQ
Security solutions for IT professionals: TechNet Security Support and Troubleshooting
Help for protecting your Windows-based computer from viruses and malware: Microsoft Secure
Local support according to your country: International Support
Propose a feature or provide feedback on Office Core: Office User Voice portal