CVE-2021-1675: Active Directory Hardening

**Executive summary:** This report details CVE-2021-1675 (PrintNightmare), a high-severity Windows Print Spooler vulnerability that can grant SYSTEM-level code execution and has been actively exploited; it identifies unpatched Windows systems as vulnerable, outlines Microsoft's July 6, 2021 out-of-band patches and recommended Group Policy/registry settings for Point and Print Restrictions, and provides instructions for applying a ThreatLocker Configuration Manager policy to mitigate the risk.