Local code execution via driver heap overflow
Published Sep 8, 2026 · Updated Sep 10, 2026
Heap-based buffer overflow in the Windows Fast FAT Driver allows local users to execute code through local access to affected Windows systems. Microsoft identifies a heap overflow in the driver but does not disclose the affected routine, malformed FAT field, or incorrect memory operation. Exploitation requires local access and high attack complexity, needs no credentials or user interaction, and executes attacker-controlled code.
Summary
What happened
Heap-based buffer overflow in the Windows Fast FAT Driver allows local users to execute code through local access to affected Windows systems. Microsoft identifies a heap overflow in the driver but does not disclose the affected routine, malformed FAT field, or incorrect memory operation. Exploitation requires local access and high attack complexity, needs no credentials or user interaction, and executes attacker-controlled code.
The record
- CVE
- CVE-2026-69347
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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 <10.0.17763.9245
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
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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