Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2021-1647
Microsoft Defender Remote Code Execution Vulnerability
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L L N U H H H 7.8 .3965 98.6 YES
AFFECTED
Product Versions Fixed
Microsoft System Center Endpoint Protection N/A – —
Microsoft System Center 2012 R2 Endpoint Protection N/A – —
Microsoft Security Essentials N/A – —
Microsoft System Center 2012 Endpoint Protection N/A – —
Windows Defender N/A – —
TIMELINE
Dec 2 Reserved by microsoft
Jan 12 Published (CNA: microsoft)
Nov 3 Added to CISA KEV, remediation due 2021-11-17
Description
Microsoft Defender Remote Code Execution Vulnerability
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| December 2, 2020 | Reserved | Reserved by microsoft |
| January 12, 2021 | Published | Published (CNA: microsoft) |
| November 3, 2021 | KEV ADDED | Added to CISA KEV, remediation due 2021-11-17 |
Affected
Affected products and packages — 5 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Microsoft | Microsoft System Center Endpoint Protection | — | N/A | — |
| Microsoft | Microsoft System Center 2012 R2 Endpoint Protection | — | N/A | — |
| Microsoft | Microsoft Security Essentials | — | N/A | — |
| Microsoft | Microsoft System Center 2012 Endpoint Protection | — | N/A | — |
| Microsoft | Windows Defender | — | N/A | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-1647 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
