Local privilege escalation via fdwsd.dll race condition
Published Apr 14, 2026 · Updated Apr 14, 2026
Race condition in Microsoft Windows Function Discovery Service allows local users to elevate privileges by winning a timing window. The fdwsd.dll service accesses a shared resource concurrently without proper synchronization, creating a TOCTOU window and heap-corruption condition. A low-privilege local account and precise timing are required; successful exploitation grants higher privileges and can compromise confidentiality, integrity, and availability.
Summary
What happened
Race condition in Microsoft Windows Function Discovery Service allows local users to elevate privileges by winning a timing window. The fdwsd.dll service accesses a shared resource concurrently without proper synchronization, creating a TOCTOU window and heap-corruption condition. A low-privilege local account and precise timing are required; successful exploitation grants higher privileges and can compromise confidentiality, integrity, and availability.
The record
- CVE
- CVE-2026-32093
- Published
- Apr 14, 2026
- Updated
- Apr 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-362, CWE-367, CWE-122, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 14, 2026CVE publishedPublication date reported by the CVE source.
- Apr 14, 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 <10.0.17763.8644
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.
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Technologies
Your stack
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Your stack
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