CRITICALVulnerability
Verified
Global

Microsoft Patches 97 Vulnerabilities Including Three Actively Exploited Zero-Days

·Source: Microsoft MSRC

Updated:

Executive Summary

March 2026 Patch Tuesday addresses 97 CVEs with three actively exploited zero-days in Windows kernel, NTLM, and Hyper-V.

Analysis

Microsoft March 2026 Patch Tuesday addresses 97 vulnerabilities across Windows, Office, Azure, and Exchange. Three zero-days are under active exploitation: CVE-2026-21399 (Windows kernel EoP), CVE-2026-21400 (NTLM hash leak), CVE-2026-21401 (Hyper-V guest escape). CISA added all three to KEV catalog with 21-day remediation deadline.

Timeline

Discovered
Mar 1, 2026
Exploitation Detected
Mar 1, 2026
Published
Mar 12, 2026
Patch Available
Mar 12, 2026

Indicators of Compromise (3)

CVE (3)
CVE-2026-21399
NVDMITRE CVE
CVE-2026-21400
NVDMITRE CVE
CVE-2026-21401
NVDMITRE CVE
Source Attribution

Originally published by Microsoft MSRC on Mar 12, 2026. Verified by: Microsoft, CISA.

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