Actively exploited · Published Jan 12, 2021 · Assigned by microsoft

CVE-2021-1647Microsoft Defender Remote Code Execution Vulnerability

High 7.8 Exploited

In plain English

A high-severity security flaw in Microsoft Security Essentials from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on November 3, 2021). The chance it is exploited in the next 30 days is estimated at 39.7% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply updates per vendor instructions.

Severity (CVSS 3.1)7.8High

Exploit odds (30 days)39.7%top 1.4% of all CVEs

Exploited in the wildYesCISA KEV since Nov 3, 2021

Attack tooling1Public PoC

CISA guidance

Apply updates per vendor instructions.

Federal agencies must remediate by Nov 17, 2021.

Official description

Microsoft Defender Remote Code Execution Vulnerability

Affected products (as reported)

Vendor	Product	Versions
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

References

Microsoft Defender Remote Code Execution Vulnerability vendor-advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1647 x_refsource_MISC, x_transferred
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1647 government-resource