Zero-day vulnerability in Windows Defender

Input validation error
CVE-2021-1647

Vulnerability details

Advisory: SB2021011213 - Remote code execution in Microsoft Defender

Vulnerable component: Windows Defender

CVE-ID: CVE-2021-1647

CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C

CWE-ID: CWE-20 - Improper Input Validation

Description:

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can pass specially crafted input to the application and execute arbitrary code on the system.

Note, the vulnerability is being actively exploited in the wild.

External links:

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-1647