A significant security vulnerability has been identified in Windows Server 2012 and Server 2012 R2, allowing attackers to bypass security measures enforced by the Mark of the Web (MotW) feature. This zero-day flaw has existed for over two years and affects certain file types, posing a risk even to fully updated systems and those with Extended Security Updates. The vulnerability was discovered by 0patch security researchers and reported to Microsoft, which has developed free micropatches to mitigate the issue until an official fix is released. The affected systems include Windows Server 2012 and 2012 R2, both updated to October 2023, and those with Extended Security Updates. Free micropatches are available for immediate protection on systems with the 0patch Agent. Security experts recommend applying the micropatches, monitoring for official updates from Microsoft, considering upgrades to supported server versions, and implementing additional security measures.