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CVE-2026-70575— Windows Schannel Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Windows 11 version 23H2
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.

Windows Schannel 中的空指针解引用漏洞允许经过授权的攻击者通过网络发起拒绝服务（DoS）攻击。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 8

VendorProduct Version RangeStatus
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-2026-70575

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Windows Schannel Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Null pointer dereference in Windows Schannel allows an authorized attacker to deny service over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
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-2026-70575

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III. Intelligence Information for CVE-2026-70575

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Vendor Advisories for CVE-2026-70575 (1)

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

CVE-2026-83941 9.9 CRITICAL Entra ID Elevation of Privilege Vulnerability
CVE-2026-69590 9.8 CRITICAL Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-69493 9.8 CRITICAL Windows Event Logging Service Remote Code Execution Vulnerability
CVE-2026-69491 9.8 CRITICAL Microsoft DirectMusic Remote Code Execution Vulnerability
CVE-2026-69431 9.8 CRITICAL Telnet Client Remote Code Execution Vulnerability
CVE-2026-78445 9.8 CRITICAL Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability
CVE-2026-78510 9.8 CRITICAL Microsoft Word Remote Code Execution Vulnerability
CVE-2026-69579 9.8 CRITICAL Windows Message Queuing Remote Code Execution Vulnerability
CVE-2026-69910 9.8 CRITICAL Windows Hyper-V Remote Code Execution Vulnerability
CVE-2026-68839 9.8 CRITICAL Windows USB Mass Storage Class Driver Remote Code Execution Vulnerability
CVE-2026-69730 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-69586 9.8 CRITICAL Microsoft Windows PDF Remote Code Execution Vulnerability
CVE-2026-69769 9.8 CRITICAL Windows HTTP Print Provider Remote Code Execution Vulnerability
CVE-2026-69845 9.8 CRITICAL Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-73010 9.8 CRITICAL Microsoft Failover Cluster Remote Code Execution Vulnerability
CVE-2026-69829 9.8 CRITICAL Windows Shell Remote Code Execution Vulnerability
CVE-2026-73025 9.8 CRITICAL Windows iSCSI Security Feature Bypass Vulnerability
CVE-2026-73009 9.8 CRITICAL Windows Secure Socket Tunneling Protocol (SSTP) Remote Code Execution Vulnerability
CVE-2026-77493 9.8 CRITICAL Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-69824 9.8 CRITICAL Microsoft Standard XPS Remote Code Execution Vulnerability

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

IV. Related Vulnerabilities

Same product: Windows 11 version 23H2
Same vendor: Microsoft
Same weakness: CWE-476

V. Comments for CVE-2026-70575

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