Active Vulnerabilities in Microsoft Defender Expose Users to Cyberattacks

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Active Vulnerabilities in Microsoft Defender Expose Users to Cyberattacks

First seen 24 May 2026, 21:00 UTC • •72.3

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ThreatCluster •May 25, 2026 at 20:32 UTC

•Two critical vulnerabilities in Microsoft Defender are actively exploited.
•CVE-2024-21314 allows remote code execution; CVE-2024-21315 enables local privilege escalation.
•Immediate patching is essential to protect developers and enterprises from cyber threats.

Microsoft has confirmed two active vulnerabilities in its Defender software, CVE-2024-21314 and CVE-2024-21315, which are being exploited by cybercriminals. CVE-2024-21314 allows remote code execution through specific file processing, while CVE-2024-21315 enables local privilege escalation. These flaws primarily affect developers and enterprises, increasing risks to endpoint security and DevOps infrastructure. Microsoft released patches for these vulnerabilities in February 2024, but systems lacking updates remain at risk. Users are urged to apply the latest updates immediately to mitigate potential attacks. The situation highlights the irony of needing to patch security software designed to protect systems. Failure to update could lead to ransomware attacks leveraging these vulnerabilities.

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Updated 152d ago How this analysis works

Timeline

2024-01-09

CVE-2024-21314 published

Microsoft disclosed a vulnerability in Defender allowing remote code execution when processing specific files.

2024-02-01

Patches released

Microsoft released patches for both vulnerabilities in its February security update.

2024-02-13

CVE-2024-21315 published

Microsoft disclosed a vulnerability in Defender that facilitates local privilege escalation.

2026-05-24

Active exploitation confirmed

Microsoft warns that the vulnerabilities are currently being exploited, urging immediate updates.

More articles in this cluster (7)

Threat Graph

8 entities, 7 inferred relationships (STIX 2.1).

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Technique (3)

Malware
T1068 - Exploitation for Privilege Escalation
T1203 - Exploitation for Client Execution

Organization (1)

Microsoft

Vulnerability (2)

CVE-2024-21314
CVE-2024-21315

Weakness (1)

CWE-269 - Improper Privilege Management

Affected Platform (1)

Microsoft Defender

Relationships

CVE-2024-21314 targets Microsoft Defender
CVE-2024-21315 targets Microsoft Defender
Malware targets Microsoft Defender
T1068 - Exploitation for Privilege Escalation targets Microsoft Defender
T1203 - Exploitation for Client Execution targets Microsoft Defender
CVE-2024-21314 related to Microsoft
CVE-2024-21314 related to CWE-269 - Improper Privilege Management

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