Authenticated code execution through undisclosed NTFS flaw
Published Nov 10, 2021 · Updated Aug 19, 2026
Remote code execution in Microsoft Windows NTFS allows local authenticated users to execute arbitrary code on affected Windows systems. Microsoft has not published the vulnerable NTFS code path, malformed input type, or incorrect operation that enables execution. Exploitation requires low-privileged local access and no user interaction; successful exploitation can compromise confidentiality, integrity, and availability.
Summary
What happened
Remote code execution in Microsoft Windows NTFS allows local authenticated users to execute arbitrary code on affected Windows systems. Microsoft has not published the vulnerable NTFS code path, malformed input type, or incorrect operation that enables execution. Exploitation requires low-privileged local access and no user interaction; successful exploitation can compromise confidentiality, integrity, and availability.
The record
- CVE
- CVE-2021-41378
- Published
- Nov 10, 2021
- Updated
- Aug 19, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 10, 2021CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.2300
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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