Vulnerability in Microsoft 365 Copilot
CVE-2021-43905
Microsoft Office app Remote Code Execution Vulnerability
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.030 (87.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.030 · change: +0.002
Affected products
- Microsoft 365 Copilot
- Microsoft Office App — versions 0
Public proof-of-concept exploits
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43905 (Patch, 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.