Vulnerability in Microsoft 365 Apps
CVE-2025-53733
Incorrect conversion between numeric types in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Microsoft 365 Apps
- Microsoft 365 Apps For Enterprise — versions 16.0.1
- 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
- Microsoft Sharepoint Enterprise Server 2016 — versions 16.0.0
- Microsoft Sharepoint Server 2019 — versions 16.0.0
- Microsoft Word 2016 — versions 16.0.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53733 (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-53733?
- CVE-2025-53733 is a high-severity vulnerability in Microsoft 365 Apps, classified under Incorrect Conversion between Numeric Types. CVSS score: 8.4/10. Published 2025-08-12.
- How severe is CVE-2025-53733?
- High severity. CVSS v3 base score is 8.4 out of 10.
- Is CVE-2025-53733 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.