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Microsoft started 2025 with an extensive security update, addressing a record 159 vulnerabilities, including eight zero-day flaws. This update is significant not only for its volume but also for containing vulnerabilities that artificial intelligence (AI) frameworks helped identify.

Among these vulnerabilities, Microsoft categorized ten as critical and the others as important. The affected systems include a variety of Microsoft technologies such as Windows OS, Azure, Microsoft Office, .NET, and Windows Hyper-V, with over 20 remote code execution vulnerabilities and numerous other types related to privilege escalation and denial-of-service flaws.

Three key vulnerabilities have been highlighted as particularly critical, requiring immediate attention due to their exploitation in the wild. These are identified as CVE-2025-21335, CVE-2025-21333, and CVE-2025-21334, all related to privilege escalation in the Windows Hyper-V NT Kernel. Exploitation of these vulnerabilities is relatively straightforward, allowing attackers with minimal permissions to elevate their access to system-level privileges.

Overall, this latest update emphasizes the ongoing challenges faced by Microsoft and its users as cyber threats evolve, highlighting the need for constant vigilance and quick responses to emerging security risks.


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