Is CVE-2021-43905 actively exploited?

CVE-2021-43905 has no public evidence of in-the-wild exploitation as of 2025-06-11.

What is the CVSS score for CVE-2021-43905?

CVE-2021-43905 has a CVSS score of 9.6 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Patch guidance is available from microsoft security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-43905.

1 product: microsoft 365 copilot.

Microsoft Office app Remote Code Execution Vulnerability

Primary Vendor: MICROSOFT
Published: 12/15/2021
Last Modified: 6/11/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.