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Patching the Holes: Microsoft Rolls Out Fixes for Defender Zero-Day Vulnerabilities

21 May 2026

Microsoft has released security patches for two zero-day vulnerabilities in Defender, one affecting the Malware Protection Engine and the other the Defender Antimalware Platform.
The flaws could allow attackers to gain system privileges or trigger denial-of-service states on Windows devices.
Microsoft has released updates to address the vulnerabilities and customers should ensure their systems are updated automatically.
The U.S.
Cybersecurity agency has ordered government agencies to secure their Windows systems against these vulnerabilities within two weeks.
Mitigations have also been shared for a recently disclosed Windows BitLocker zero-day flaw.