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CVE-2017-8591

25
FAUCET Score

CVE-2017-8591 is a remote code execution vulnerability in the Windows Input Method Editor (IME) affecting various versions of Windows 8.1, 10, and Server 2012/2016. This flaw stems from improper memory handling within the IME, allowing an attacker to execute arbitrary code. With a CVSS score of 7.8 (HIGH), it presents a significant risk, enabling high impact to confidentiality, integrity, and availability with low attack complexity and no user interaction required, though local access is needed. While no public exploit code is currently available (Metasploit, Nuclei, ExploitDB), and it's not listed in CISA's KEV catalog, it did receive some community and media attention at the time of disclosure.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
1511CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:1511:*:*:*:*:*:*:*
1607CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:*
1703CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8.1:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
3.97%
Probability of exploitation in next 30 days
EPSS Percentile
89.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0397 is in the 98th percentile among its peer group of 17,061 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (18)

microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1703 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1703 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1511 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1511 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for 32-bit Systems
View patch
microsoftpatch availablevia msrc
Product: Windows 10 Version 1607 for x64-based Systems
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2016
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2016 (Server Core installation)
View patch
microsoftpatch availablevia msrc
Product: Windows 8.1 for 32-bit systems
View patch
microsoftpatch availablevia msrc
Product: Windows 8.1 for x64-based systems
View patch
microsoftpatch availablevia msrc
Product: Windows RT 8.1
microsoftpatch availablevia msrc
Product: Windows Server 2012
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 (Server Core installation)
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 R2
View patch
microsoftpatch availablevia msrc
Product: Windows Server 2012 R2 (Server Core installation)
View patch

Vendor Advisories (1)

microsoft2017-Aug/CVE-2017-8591Critical

Windows IME Remote Code Execution Vulnerability

Aug 8, 2017

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2017-8591
PatchVendor Advisory
securityfocus.com / bid/99430
Third Party AdvisoryVDB Entry
securitytracker.com / id/1039097
Third Party AdvisoryVDB Entry