System hang via improperly handled file operations
Published May 21, 2020 · Updated Aug 19, 2026
Denial of service in Microsoft Windows Connected User Experiences and Telemetry Service allows local users to hang the system. Microsoft has not disclosed which service code path, file object, or operation is mishandled by the specially crafted application. Exploitation requires an authenticated local session and application execution; the documented consequence is an unresponsive system.
Summary
What happened
Denial of service in Microsoft Windows Connected User Experiences and Telemetry Service allows local users to hang the system. Microsoft has not disclosed which service code path, file object, or operation is mishandled by the specially crafted application. Exploitation requires an authenticated local session and application execution; the documented consequence is an unresponsive system.
The record
- CVE
- CVE-2020-1123
- Published
- May 21, 2020
- Updated
- Aug 19, 2026
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 21, 2020CVE publishedPublication date reported by the CVE source.
- Aug 19, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=10.0.10240.0 <publication
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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