CVEs / CVE-2021-1647
CVE-2021-1647: Microsoft Defender Remote Code Execution Vulnerability
- Known exploited in the CISA KEV catalog since 3 Nov 2021
- high 7.2 CVSS 2.0 (NVD)
- EPSS 39.6% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Microsoft Defender contains an unspecified vulnerability that allows for remote code execution.
Description
Microsoft Defender Remote Code Execution Vulnerability
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| 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 | — |
Exploitation
| In CISA KEV since | 3 Nov 2021 |
|---|---|
| Due date for US federal agencies | 17 Nov 2021 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 2.0 | 7.2 highAV:L/AC:L/Au:N/C:C/I:C/A:CScored by NVD |
|---|
References
- CVE-2021-1647 on NVD
- CVE-2021-1647 in the CISA KEV catalog
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647 Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1647 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1647 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.