CVE-2021-43905
Critical
Published: 15 December 2021
Published
15 December 2021
Modified
11 June 2025
KEV Added
—
Patch
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CVSS Score v3.1
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS Score
0.0089
76.0th percentile
Risk Priority
20
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-43905 is a critical-severity an unspecified weakness vulnerability in Microsoft 365 Copilot. Its CVSS base score is 9.6 (Critical).
Operationally, ranked in the top 24.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-30767
Vulnerability details
Microsoft Office app Remote Code Execution Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
microsoft
365 copilot
≤ 18.2110.13110.0
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.