VulnerabilityAnalyzed
CVE-2021-1647
Microsoft Defender Remote Code Execution Vulnerability
KEVHIGH 7.8EPSS 39.4%
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2021). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Microsoft Defender Remote Code Execution Vulnerability
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 39.39% probability · 99th percentile
- CISA KEV
- Listed 3 November 2021 · due 17 November 2021
- Affected
- microsoft/windows defender · microsoft/security essentials · microsoft/system center endpoint protection
- Source
- secure@microsoft.com
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2021-1647
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1647Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1647Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1647US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.