CVE-2026-34345: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-34345) is a concurrency issue classified under CWE-362, occurring in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). The flaw arises from accessing a shared resource using an incompatible type, causing a race condition that can be exploited by an authorized local attacker to elevate privileges. Microsoft has assigned a CVSS v3.1 base score of 7.0 (High) with attack vector local, high attack complexity, low privileges required, no user interaction, and impacts on confidentiality, integrity, and availability. An official fix is available as per Microsoft’s advisory.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges on the affected Windows 10 Version 1607 system. This can lead to full system compromise, including unauthorized access to sensitive data and disruption of system availability. The vulnerability impacts confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34345 to remediate this issue.
CVE-2026-34345: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Microsoft Windows 10 Version 1607
Description
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.0high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-34345) is a concurrency issue classified under CWE-362, occurring in the Windows Ancillary Function Driver for WinSock on Windows 10 Version 1607 (build 10.0.14393.0). The flaw arises from accessing a shared resource using an incompatible type, causing a race condition that can be exploited by an authorized local attacker to elevate privileges. Microsoft has assigned a CVSS v3.1 base score of 7.0 (High) with attack vector local, high attack complexity, low privileges required, no user interaction, and impacts on confidentiality, integrity, and availability. An official fix is available as per Microsoft’s advisory.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges on the affected Windows 10 Version 1607 system. This can lead to full system compromise, including unauthorized access to sensitive data and disruption of system availability. The vulnerability impacts confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34345 to remediate this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-03-26T21:02:16.446Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34345","vendor":"Microsoft"}]
Threat ID: 6a036540cbff5d861008c490
Added to database: 05/12/2026, 17:37:04 UTC
Last enriched: 06/19/2026, 17:33:18 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 50
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.