Message : Required fields Zerologon has quickly become valuable to nation-state threat actors and ransomware gangs, making it imperative for organizations to apply these patches immediately if they have not yet done so. Background On February 9, as part of its February 2021 Patch Tuesday release, Microsoft released an additional patch for Zerologon to enable a security setting by default to protect vulnerable systems. CVE-2020-1472, also known as 'Zerologon,' is a critical elevation of privilege vulnerability in Microsoft's Netlogon Remote Protocol. It was initially patched in Microsoft's August 2020 Patch Tuesday. The vulnerability received a CVSSv3 score of 10.0, the maximum possible score, and a Vulnerability Priority Rating (VPR) score of 10, underscoring its severity.