What is CVE-2017-8566?

CVE-2017-8566 is a high-severity vulnerability in Microsoft Windows 10, classified under Improper Input Validation. CVSS score: 7.0/10. Published 2017-07-11.

How severe is CVE-2017-8566?

High severity. CVSS v3 base score is 7.0 out of 10.

Improper input validation in Microsoft Windows 10

CVE-2017-8566

Microsoft Windows 1607, 1703, and Windows Server 2016 allows an elevation of privilege vulnerability due to Windows Input Method Editor (IME) improperly handling parameters in a method of a DCOM class, aka "Windows IME Elevation of Privilege Vulnerability".

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-07-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.7th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Microsoft Windows 10 — versions 1607, 1703
Microsoft Windows Server 2016
Microsoft Corporation Windows 1607, 1703, And Server 2016. — versions Microsoft Windows

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.securityfocus.com/bid/99404 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1038853 (VDB Entry, Third Party Advisory, vdb-entry)
portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8566 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2017-8566?: CVE-2017-8566 is a high-severity vulnerability in Microsoft Windows 10, classified under Improper Input Validation. CVSS score: 7.0/10. Published 2017-07-11.
How severe is CVE-2017-8566?: High severity. CVSS v3 base score is 7.0 out of 10.