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CVE-2026-35423— Windows 11 Telnet Client Information Disclosure Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 1607
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 Telnet Client是美国微软（Microsoft）公司的 一个Windows操作系统内置的网络命令行实用工具，常用于执行远程登录、测试端口连通性以及进行系统和设备的远程管理。 Microsoft Telnet Client存在缓冲区错误漏洞。攻击者利用该漏洞可以获取敏感信息。以下产品和版本受到影响：Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems,Wi

CVSS 5.4 · Medium EPSS 0.75% · P52

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 21

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.9140 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.8755 affected
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.7291 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.7417 affected
Microsoft Windows 11 version 23H2 10.0.22631.0< 10.0.22631.7079 affected
Microsoft Windows 11 Version 23H2 10.0.22631.0< 10.0.22631.7219 affected
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.8457 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.8457 affected
Microsoft Windows 11 version 26H1 10.0.28000.0< 10.0.28000.2113 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.26079 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.26079 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.23181 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.23181 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.9140 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.9140 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.8755 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.8755 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.5139 affected
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0< 10.0.25398.2330 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.32860 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.32860 affected
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I. Basic Information for CVE-2026-35423

Vulnerability Information
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Vulnerability Title
Windows 11 Telnet Client Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Out-of-bounds read in Telnet Client allows an unauthorized attacker to disclose information over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Telnet Client 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Telnet Client是美国微软（Microsoft）公司的 一个Windows操作系统内置的网络命令行实用工具，常用于执行远程登录、测试端口连通性以及进行系统和设备的远程管理。 Microsoft Telnet Client存在缓冲区错误漏洞。攻击者利用该漏洞可以获取敏感信息。以下产品和版本受到影响：Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems,Wi
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 Subscribe
Microsoft Windows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.9140 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8755 -
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.7291 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.7417 -
Microsoft Windows 11 version 23H2 10.0.22631.0 ~ 10.0.22631.7079 -
Microsoft Windows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.7219 -
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.8457 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.8457 -
Microsoft Windows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.2113 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.26079 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.26079 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.23181 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.23181 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.9140 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.9140 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.8755 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8755 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.5139 -
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.2330 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.32860 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32860 -

II. Public POCs for CVE-2026-35423

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III. Intelligence Information for CVE-2026-35423

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Vendor Advisories for CVE-2026-35423 (1)

Same Patch Batch · Microsoft · 2026-05-12 · 125 CVEs total

CVE-2026-42898 9.9 CRITICAL Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-42823 9.9 CRITICAL Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-41089 9.8 CRITICAL Windows Netlogon Remote Code Execution Vulnerability
CVE-2026-41096 9.8 CRITICAL Windows DNS Client Remote Code Execution Vulnerability
CVE-2026-40379 9.3 CRITICAL Azure Entra ID Spoofing Vulnerability
CVE-2026-40402 9.3 CRITICAL Windows Hyper-V Elevation of Privilege Vulnerability
CVE-2026-42833 9.1 CRITICAL Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability
CVE-2026-33117 9.1 CRITICAL Azure SDK for Java Security Feature Bypass Vulnerability
CVE-2026-41103 9.1 CRITICAL Microsoft SSO Plugin for Jira & Confluence Elevation of Privilege Vulnerability
CVE-2026-33110 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-35439 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40403 8.8 HIGH Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-40370 8.8 HIGH SQL Server Remote Code Execution Vulnerability
CVE-2026-35436 8.8 HIGH Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-40365 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-40420 8.8 HIGH Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
CVE-2026-41094 8.8 HIGH Microsoft Data Formulator Remote Code Execution Vulnerability
CVE-2026-41086 8.8 HIGH Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability
CVE-2026-33112 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-34329 8.8 HIGH Microsoft Message Queuing (MSMQ) Remote Code Execution Vulnerability

Showing top 20 of 125 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-125

V. Comments for CVE-2026-35423

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