Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
A user needs to be tricked into running malicious files.
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
An attacker who successfully exploited this vulnerability could bypass the Windows Defender Attack Surface Reduction blocking feature.
How can I check if I'm protected from this vulnerability?
This vulnerability existed in the Defender Security Intelligence Updates and not the Malware protection engine. The version of the signatures that addressed the vulnerability is 1.379.200.0 and was updated automatically. Check the current version in Windows Update history Definition Updates to see the most recently installed definitions.
Security updates
1.379.200.0 — https://learn.microsoft.com/en-us/microsoft-365/security/defender-endpoint/manage-updates-baselines-microsoft-defender-antivirus?view=o365-worldwide#security-intelligence-updates
Vulnerabilities 1
-
High 7.8
Microsoft Defender for Endpoint Security Feature Bypass Vulnerability
Microsoft Defender for Endpoint Security Feature Bypass Vulnerability
Revision history
-
#2
Added FAQ information. This is an informational change only.
-
#1
Information published.
References
-
CVE-2023-21809 Microsoft Defender for Endpoint Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21809
-
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
-
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
-
Common Vulnerability Scoring System
https://www.first.org/cvss