CVE-2026-20919
Race Condition in Windows SMB Server Enables Privilege Escalation
Publication date: 2026-01-13
Last updated on: 2026-01-13
Assigner: Microsoft Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_smb_server | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-362 | The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a race condition in the Windows SMB Server where concurrent execution using a shared resource occurs without proper synchronization. This flaw allows an authorized attacker to exploit the race condition to elevate their privileges over a network. [1]
How can this vulnerability impact me? :
An attacker who is authorized on the network can exploit this vulnerability to elevate their privileges, potentially gaining higher-level access than intended. This can lead to unauthorized actions, data compromise, or further attacks within the affected system. [1]