CVE-2026-20927: 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 deny service over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20927) involves a race condition (CWE-362) in the Windows SMB Server on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization when accessing shared resources can be exploited by an authorized attacker to cause a denial of service (DoS) condition remotely over the network. The issue does not impact confidentiality or integrity but affects availability. Microsoft has released an official patch to address this vulnerability.
Potential Impact
An authorized attacker can exploit this race condition vulnerability to cause a denial of service on the affected Windows 10 Version 1607 system via the SMB Server. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20927 to remediate this vulnerability.
CVE-2026-20927: 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 deny service over a network.
CVSS v3.1
Score 5.3medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20927) involves a race condition (CWE-362) in the Windows SMB Server on Windows 10 Version 1607 (build 10.0.14393.0). Improper synchronization when accessing shared resources can be exploited by an authorized attacker to cause a denial of service (DoS) condition remotely over the network. The issue does not impact confidentiality or integrity but affects availability. Microsoft has released an official patch to address this vulnerability.
Potential Impact
An authorized attacker can exploit this race condition vulnerability to cause a denial of service on the affected Windows 10 Version 1607 system via the SMB Server. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20927 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-04T20:04:16.336Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20927","vendor":"Microsoft"}]
Threat ID: 69668ae3a60475309f9ae1d5
Added to database: 01/13/2026, 18:11:47 UTC
Last enriched: 07/30/2026, 23:40:04 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 238
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