CVE-2026-69374: CWE-770: Allocation of Resources Without Limits or Throttling in Microsoft Windows 10 Version 21H2
Description
CVE-2026-69374 is a vulnerability in Microsoft Windows 10 Version 21H2 SMB Server where resource allocation occurs without limits or throttling. This flaw allows an authorized attacker to cause a denial of service (DoS) over a network. The vulnerability affects multiple builds of Windows 10 21H2 and related versions. A patch is available from Microsoft to address this issue.
CVSS v3.1
Score 6.5medium
Affected software
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-69374) involves the allocation of resources without limits or throttling in the Windows SMB Server component of Microsoft Windows 10 Version 21H2. An authorized attacker can exploit this flaw to cause a denial of service condition by exhausting system resources over the network. The CVSS v3.1 base score is 6.5 (medium severity), reflecting network attack vector, low attack complexity, required privileges, no user interaction, and impact limited to availability. Microsoft has released an official fix for affected versions.
Potential Impact
Successful exploitation results in denial of service (DoS) by exhausting system resources on the SMB Server, causing service disruption. There is no impact on confidentiality or integrity. The attack requires an authorized user and network access.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69374 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T20:54:04.486Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69374","vendor":"Microsoft"}]
Threat ID: 6aa044edacd9273b49fa7efa
Added to database: 09/08/2026, 17:25:01 UTC
Last enriched: 10/16/2026, 21:07:32 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 39
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