CISA has issued an urgent advisory regarding a Microsoft Windows privilege escalation vulnerability, CVE-2021-43226, affecting various Windows versions, including Windows 10 and Windows 11. This vulnerability allows authenticated attackers to elevate their access to SYSTEM level by exploiting the Common Log File System Driver’s memory management flaws. With proof-of-concept exploit code already circulating in underground forums, the risk of active exploitation is heightened, prompting CISA to enforce a mandatory remediation deadline of October 27, 2025. Organizations are urged to prioritize patching critical infrastructure and conduct vulnerability assessments to mitigate potential attacks, underscoring the importance of robust cybersecurity measures in an increasingly threat-prone digital landscape.