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CVE-2025-53809— Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Windows 11 Version 24H2
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 Local Security Authority Subsystem Service是美国微软（Microsoft）公司的一个内部程序，负责运行Windows系统安全政策。它在用户登录时电脑单机或服务器时，验证用户身份，管理用户密码变更，并产生访问字符。它也会在窗口安全日志中留下应有的记录。 Microsoft Windows Local Security Authority Subsystem Service存在输入验证错误漏洞。攻击者利用该漏洞导致系统拒绝服务。以下

CVSS 6.5 · Medium EPSS 1.47% · P72

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-53809

Vulnerability Information
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Vulnerability Title
Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) 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
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Local Security Authority Subsystem Service 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Local Security Authority Subsystem Service是美国微软（Microsoft）公司的一个内部程序，负责运行Windows系统安全政策。它在用户登录时电脑单机或服务器时，验证用户身份，管理用户密码变更，并产生访问字符。它也会在窗口安全日志中留下应有的记录。 Microsoft Windows Local Security Authority Subsystem Service存在输入验证错误漏洞。攻击者利用该漏洞导致系统拒绝服务。以下
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 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.6584 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.6584 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.6584 -

II. Public POCs for CVE-2025-53809

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III. Intelligence Information for CVE-2025-53809

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Same Patch Batch · Microsoft · 2025-09-09 · 80 CVEs total

CVE-2025-55232 9.8 CRITICAL Microsoft High Performance Compute (HPC) Pack Remote Code Execution Vulnerability
CVE-2025-55234 8.8 HIGH Windows SMB Elevation of Privilege Vulnerability
CVE-2025-54897 8.8 HIGH Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2025-54110 8.8 HIGH Windows Kernel Elevation of Privilege Vulnerability
CVE-2025-54106 8.8 HIGH Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2025-54113 8.8 HIGH Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2025-54918 8.8 HIGH Windows NTLM Elevation of Privilege Vulnerability
CVE-2025-55227 8.8 HIGH Microsoft SQL Server Elevation of Privilege Vulnerability
CVE-2025-54910 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2025-55228 7.8 HIGH Windows Graphics Component Remote Code Execution Vulnerability
CVE-2025-54913 7.8 HIGH Windows UI XAML Maps MapControlSettings Elevation of Privilege Vulnerability
CVE-2025-49692 7.8 HIGH Azure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2025-55245 7.8 HIGH Xbox Gaming Services Elevation of Privilege Vulnerability
CVE-2025-55316 7.8 HIGH Azure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2025-55317 7.8 HIGH Microsoft AutoUpdate (MAU) Elevation of Privilege Vulnerability
CVE-2025-54916 7.8 HIGH Windows NTFS Remote Code Execution Vulnerability
CVE-2025-54912 7.8 HIGH Windows BitLocker Elevation of Privilege Vulnerability
CVE-2025-54900 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2025-54098 7.8 HIGH Windows Hyper-V Elevation of Privilege Vulnerability
CVE-2025-55224 7.8 HIGH Windows Hyper-V Remote Code Execution Vulnerability

Showing top 20 of 80 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 11 Version 24H2
Same vendor: Microsoft
Same weakness: CWE-20

V. Comments for CVE-2025-53809

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