Vulnerability in Microsoft 365 Apps For Enterprise
CVE-2025-54899
Free of memory not on the heap in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
EPSS: 0.001 (32.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C.
Affected products
- Microsoft 365 Apps For Enterprise — versions 16.0.1
- Microsoft Excel 2016 — versions 16.0.0.0
- Microsoft Office 2019 — versions 19.0.0
- Microsoft Office Ltsc 2021 — versions 16.0.1
- Microsoft Office Ltsc 2024 — versions 16.0.0
- Microsoft Office Ltsc For Mac 2021 — versions 16.0.1
- Microsoft Office Ltsc For Mac 2024 — versions 16.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- Microsoft Excel Remote Code Execution Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2025-54899?
- CVE-2025-54899 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under CWE-590. CVSS score: 7.8/10. Published 2025-09-09.
- How severe is CVE-2025-54899?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2025-54899 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.