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CVE-2021-1647: Microsoft Defender Remote Code Execution Vulnerability
Microsoft Defender · in CISA KEV since 2021-11-03
2021-11-03added to KEV
2021-11-17federal remediation due date
39.39%EPSS exploit probability (30 days) 98.5th percentile
7.8 HIGHCVSS 3.1
Unknownknown ransomware use
295days from NVD publication to KEV
What it is
Microsoft Defender contains an unspecified vulnerability that allows for remote code execution.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-122;CWE-1285 |
|---|---|
| CVSS vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2021-01-12 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2021-1647.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.