Vulnerability in Microsoft Security Essentials
CVE-2021-1647
Microsoft Defender Remote Code Execution Vulnerability
EPSS: 0.761 (98.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: 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.
Affected products
- Microsoft Security Essentials — versions N/A
- Microsoft System Center 2012 Endpoint Protection — versions N/A
- Microsoft System Center 2012 R2 Endpoint Protection — versions N/A
- Microsoft System Center Endpoint Protection — versions N/A
- Microsoft Windows Defender — versions N/A
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- Microsoft Defender Remote Code Execution Vulnerability (vendor-advisory)
Frequently asked questions
- What is CVE-2021-1647?
- CVE-2021-1647 is a high-severity vulnerability in Microsoft Security Essentials. CVSS score: 7.8/10. Published 2021-01-12.
- How severe is CVE-2021-1647?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-1647 known to be exploited?
- Yes. CVE-2021-1647 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 20 public proof-of-concept repositories are indexed.