Microsoft's January 2025 Patch Tuesday addresses 159 vulnerabilities, including eight zero-day vulnerabilities with three actively exploited in the wild. Key updates fix Windows Hyper-V elevation of privilege vulnerabilities (CVE-2025-21333, CVE-2025-21334, CVE-2025-21335) exploited for SYSTEM privileges. Other notable fixes include an NTLM credential leak via Windows Themes spoofing vulnerability (CVE-2025-21308) and remote code execution in Microsoft Access. Major vendors, including Adobe, Cisco, Fortinet, and SonicWall, also released patches for critical security flaws. Immediate update installation is recommended to mitigate risks.

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