CVE-2026-20934: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability involves a race condition (CWE-362) in the Windows SMB Server on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization during concurrent execution of shared resources allows an authorized attacker to elevate privileges remotely over the network. The vulnerability has been assigned CVE-2026-20934 and is rated with a CVSS 3.1 base score of 7.5, indicating high severity. Microsoft has released an official fix to remediate this issue, as detailed in their security update guide.
Potential Impact
An authorized attacker can exploit this race condition vulnerability over the network to elevate their privileges on the affected Windows 10 Version 1607 system. This could lead to full control of the system, impacting confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Apply the official security update provided by Microsoft for Windows 10 Version 1607 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20934 for the patch and detailed remediation instructions.
CVE-2026-20934: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a race condition (CWE-362) in the Windows SMB Server on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization during concurrent execution of shared resources allows an authorized attacker to elevate privileges remotely over the network. The vulnerability has been assigned CVE-2026-20934 and is rated with a CVSS 3.1 base score of 7.5, indicating high severity. Microsoft has released an official fix to remediate this issue, as detailed in their security update guide.
Potential Impact
An authorized attacker can exploit this race condition vulnerability over the network to elevate their privileges on the affected Windows 10 Version 1607 system. This could lead to full control of the system, impacting confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Apply the official security update provided by Microsoft for Windows 10 Version 1607 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20934 for the patch and detailed remediation instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-04T20:04:16.337Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20934","vendor":"Microsoft"}]
Threat ID: 69668ae4a60475309f9ae1f3
Added to database: 01/13/2026, 18:11:48 UTC
Last enriched: 07/30/2026, 23:39:22 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 208
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