Vulnerability in Microsoft 365_copilot

CVE-2021-43905

Microsoft Office app Remote Code Execution Vulnerability

EPSS: 0.028 (85.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Microsoft 365_copilot
Microsoft Office App — versions 0

Public proof-of-concept exploits

MarcoSantibanez/Remediation-of-Identified-Vulnerabilities-Using-Nessus

References

secure@microsoft.com (Patch, x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-43905?: CVE-2021-43905 is a critical-severity vulnerability in Microsoft 365_copilot. CVSS score: 9.6/10. Published 2021-12-15.
How severe is CVE-2021-43905?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2021-43905 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.