20th June 2019

Virtualization Environment TCP Selective Acknowledgment (SACK) vulnerability

In response to the TCP Selective Acknowledgment (SACK) vulnerability security issues recently reported in the Linux Kernel (CVEs: CVE-2019-11477, CVE-2019-11478, and CVE-2019-11479), we will be performing critical security updates to the Virtualization Environment Cluster. We will be applying these updates tonight, on Friday, Jun 21, 2019 at 01:00 EDT.

There will be a brief periods when Web, Email Hosting, and DNS panel become temporarily unavailable for a few minutes.

For customers with unmanaged services to stay safe you will need to take action yourself to ensure you have the latest operating system patches installed. You will then need to reboot your servers.

Due to this being a critical security vulnerability we apologize for the short notice of this maintenance window.