It is important to clarify at the outset: Windows Server 2016 build 14393.970 (not 14393970) is the correct version string for the April 2017 cumulative update for the Windows Server 2016 Long-Term Servicing Branch (LTSB). The number “2021” in your keyword likely refers to a later search date or a misconception—Microsoft did not release a build with that exact 8-digit sequence. This article will provide a comprehensive technical deep dive into the genuine KB4015217 (build 14393.970) from April 2017, its implications for enterprise environments, and why it remains relevant to administrators researching legacy builds for 2021 patching cycles.
Beyond CVEs, Microsoft included:
Windows Server 2016 Build 14393.970 (en-US) was a significant update released in April 2017. This build included various security enhancements, bug fixes, and performance improvements. Although it is no longer fully supported in 2021, it remains a widely used build in many organizations. Organizations still running this build are encouraged to upgrade to a more recent version of Windows Server to ensure they receive the latest security updates and support. windows server 2016 build 14393970 enus april 2017 2021