Yesterday was January’s big Patch Tuesday, where Microsoft rolled out a big bundle of security updates across several apps and services, eliminating 159 security vulnerabilities. This is the most extensive Patch Tuesday of the last few years with more than double the usual number of fixed security flaws.

This January 2025 Patch Tuesday is bringing the usual roll-up of updates to Windows 10. The updates are available for Windows 10 20H2, Windows 10 21H2, and Windows 10 22H2 (versions 2004, 20H2, and 21H2, respectively) with KB5049981.

Microsoft has focused its January 2025 patch tuesday cycle on fixing critical Hyper-V and OLE flaws, securing virtualized environments and enterprise workflows.

Microsoft kicked off 2025 with a new set of patches for a total of 161 security vulnerabilities across its software portfolio, including three zero-days that have been actively exploited in attacks. Of the 161 flaws,

Microsoft today unleashed updates to plug a whopping 161 security vulnerabilities in Windows and related software, including three “zero-day” weaknesses that are already under active attack. Redmond’s inaugural Patch Tuesday of 2025 bundles more fixes than the company has shipped in one go since 2017.