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CVE-2026-69374— Windows SMB Server Denial of Service Vulnerability

Quick assessment

Affected

Microsoft Windows 10 Version 21H2

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows SMB Server是美国Microsoft公司的一款提供网络文件共享与打印服务的系统软件。 Microsoft Windows SMB Server存在资源管理错误漏洞，该漏洞源于Windows SMB Server资源分配无限制或未节流，可能导致已授权攻击者通过网络造成拒绝服务。

CVSS 6.5 · Medium EPSS 1.14% · P66 Updated Oct 15, 2026

Possible ATT&CK Techniques 3 AI

T1204.001 · Malicious Link T1040.004 T1499 · Endpoint Denial of Service

Affected Version Matrix 10

Vendor	Product	Version Range	Status
Microsoft	Windows 10 Version 21H2	`10.0.19044.0< 10.0.19044.7725`	affected
Microsoft	Windows 10 Version 22H2	`10.0.19045.0< 10.0.19045.7725`	affected
Microsoft	Windows 11 version 23H2	`10.0.22631.0< 10.0.22631.7582`	affected
Microsoft	Windows 11 Version 23H2	`10.0.22631.0< 10.0.22631.7582`	affected
Microsoft	Windows 11 Version 24H2	`10.0.26100.0< 10.0.26100.9445`	affected
Microsoft	Windows 11 Version 25H2	`10.0.26200.0< 10.0.26200.9445`	affected
Microsoft	Windows 11 version 26H1	`10.0.28000.0< 10.0.28000.2954`	affected
Microsoft	Windows Server 2022	`10.0.20348.0< 10.0.20348.5622`	affected
Microsoft	Windows Server 2025	`10.0.26100.0< 10.0.26100.33438`	affected
Microsoft	Windows Server 2025 (Server Core installation)	`10.0.26100.0< 10.0.26100.33438`	affected

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I. Basic Information for CVE-2026-69374

Vulnerability Information

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Vulnerability Title

Windows SMB Server Denial of Service Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Allocation of resources without limits or throttling in Windows SMB Server allows an authorized attacker to deny service over a network.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

不加限制或调节的资源分配

Source: CVE Program / CVE List V5

Vulnerability Title

Microsoft Windows SMB Server 资源管理错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Microsoft	Windows 10 Version 21H2	10.0.19044.0 ~ 10.0.19044.7725	-
Microsoft	Windows 10 Version 22H2	10.0.19045.0 ~ 10.0.19045.7725	-
Microsoft	Windows 11 version 23H2	10.0.22631.0 ~ 10.0.22631.7582	-
Microsoft	Windows 11 Version 23H2	10.0.22631.0 ~ 10.0.22631.7582	-
Microsoft	Windows 11 Version 24H2	10.0.26100.0 ~ 10.0.26100.9445	-
Microsoft	Windows 11 Version 25H2	10.0.26200.0 ~ 10.0.26200.9445	-
Microsoft	Windows 11 version 26H1	10.0.28000.0 ~ 10.0.28000.2954	-
Microsoft	Windows Server 2022	10.0.20348.0 ~ 10.0.20348.5622	-
Microsoft	Windows Server 2025	10.0.26100.0 ~ 10.0.26100.33438	-
Microsoft	Windows Server 2025 (Server Core installation)	10.0.26100.0 ~ 10.0.26100.33438	-

II. Public POCs for CVE-2026-69374

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-69374

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Vendor Advisories for CVE-2026-69374 (1)

🔗 CVE-2026-69374 - Security Update Guide - Microsoft - Windows SMB Server Denial of Service Vulnerability Read full article vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2026-69374

Same Patch Batch · Microsoft · 2026-09-08 · 966 CVEs total

CVE-2026-83941	9.9 CRITICAL	Entra ID Elevation of Privilege Vulnerability
CVE-2026-69845	9.8 CRITICAL	Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69769	9.8 CRITICAL	Windows HTTP Print Provider Remote Code Execution Vulnerability
CVE-2026-69496	9.8 CRITICAL	Windows Compressed Folder Remote Code Execution Vulnerability
CVE-2026-69910	9.8 CRITICAL	Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-72979	9.8 CRITICAL	Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-69595	9.8 CRITICAL	Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2026-69768	9.8 CRITICAL	Windows RNDIS Remote Code Execution Vulnerability
CVE-2026-69730	9.8 CRITICAL	Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-72983	9.8 CRITICAL	Internet Connection Sharing (ICS) Remote Code Execution Vulnerability
CVE-2026-72982	9.8 CRITICAL	Windows Netlogon Remote Code Execution Vulnerability
CVE-2026-69276	9.8 CRITICAL	Microsoft UxTheme Library (uxtheme.dll) Remote Code Execution Vulnerability
CVE-2026-78445	9.8 CRITICAL	Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2026-69525	9.8 CRITICAL	Remote Desktop Services Remote Code Execution Vulnerability
CVE-2026-69824	9.8 CRITICAL	Microsoft Standard XPS Remote Code Execution Vulnerability
CVE-2026-77493	9.8 CRITICAL	Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-69586	9.8 CRITICAL	Microsoft Windows PDF Remote Code Execution Vulnerability
CVE-2026-67631	9.8 CRITICAL	Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-69715	9.8 CRITICAL	Windows Direct Show Remote Code Execution Vulnerability
CVE-2026-69829	9.8 CRITICAL	Windows Shell Remote Code Execution Vulnerability

Showing top 20 of 966 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 10 Version 21H2

Same vendor: Microsoft

Same weakness: CWE-770