Buffer overflow in Microsoft 365 Copilot
CVE-2025-30388
Heap-based buffer overflow in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.042 (90.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.039 · newest: 0.042 · change: +0.003
Affected products
- Microsoft 365 Copilot
- Microsoft Office For Android — versions 16.0.1
- Microsoft Office For Universal — versions 16.0.1
- Microsoft Office Ltsc For Mac 2021 — versions 16.0.1
- Microsoft Office Ltsc For Mac 2024 — versions 16.0.0
- Microsoft Office
- Microsoft Office Long Term Servicing Channel — versions 2021, 2024
- Microsoft Windows 10 1507
- Microsoft Windows 10 1607
- Microsoft Windows 10 1809
Weakness classification (CWE)
Public proof-of-concept exploits
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-30388 (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-30388?
- CVE-2025-30388 is a high-severity vulnerability in Microsoft 365 Copilot, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2025-05-13.
- How severe is CVE-2025-30388?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2025-30388 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.