CVE-2021-1647 kev in the critical feed json
Microsoft Defender Remote Code Execution Vulnerability
published 2021-01-12 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-7114
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2021-11-03
- epss
- 39.7%
- EPSS 39.7% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
Microsoft Defender Remote Code Execution Vulnerability
Patch / fix
cisa required action Apply updates per vendor instructions.
Timeline
- 0-day patched (Project Zero)
- Published
- Added to CISA KEV
- CISA patch deadline
- CISA SSVC: exploitation active
Known exploited
- Added
- 5 y ago
- Patch by
- 2021-11-17 (4 y ago)
- Ransomware
- Not known
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- Microsoft, Defender
- CISA name
- Microsoft Defender Remote Code Execution Vulnerability
Zero-day
Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.
- Patched
- 2021-01-12
- Details
- project zero root cause analysis
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
39.65% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.2 | AV:L/AC:L/Au:N/C:C/I:C/A:C |
Affected products
- Microsoft Microsoft System Center Endpoint Protection
- Microsoft Microsoft System Center 2012 R2 Endpoint Protection
- Microsoft Microsoft Security Essentials
- Microsoft Microsoft System Center 2012 Endpoint Protection
- Microsoft Windows Defender
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-1647
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-1647
patch, vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1647
government-resource, us-government-resource
Sources
- CVE List CVE-2021-1647
- NVD CVE-2021-1647
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.