The vulnerability could allow remote code execution if an attacker sends specially crafted packets to a Windows server.This security update is rated Critical for all supported releases of Microsoft Windows. For more information, see the Affected Software section.

The security update addresses the vulnerability by correcting how Schannel sanitizes specially crafted packets. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability. For more information about this update, see Microsoft Knowledge Base Article 2992611. Learn more.