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CVE-2026-23666— .NET Framework Denial of Service Vulnerability

Quick assessment

Affected
Microsoft Microsoft .NET Framework 3.5
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 .NET Framework是美国微软（Microsoft）公司的一种全面且一致的编程模型，也是一个用于构建Windows、Windows Store、Windows Phone、Windows Server和Microsoft Azure的应用程序的开发平台。该平台包括C#和Visual Basic编程语言、公共语言运行库和广泛的类库。 Microsoft .NET Framework存在安全漏洞。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：Microsoft .NET

CVSS 7.5 · High EPSS 1.33% · P69

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
Microsoft Microsoft .NET Framework 3.5 3.5.0< 2.0.50727.8982 & 3.0.30729.8976 affected
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0< 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0 affected
Microsoft Microsoft .NET Framework 3.5 AND 4.8 4.8.0< 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0 affected
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1< 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 affected
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0< 4.8.4801.0 affected
Microsoft Microsoft .NET Framework 4.8 4.8.0< 4.8.4801.0 affected
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I. Basic Information for CVE-2026-23666

Vulnerability Information
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Vulnerability Title
.NET Framework Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件的处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft .NET Framework 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft .NET Framework是美国微软（Microsoft）公司的一种全面且一致的编程模型，也是一个用于构建Windows、Windows Store、Windows Phone、Windows Server和Microsoft Azure的应用程序的开发平台。该平台包括C#和Visual Basic编程语言、公共语言运行库和广泛的类库。 Microsoft .NET Framework存在安全漏洞。攻击者利用该漏洞导致系统拒绝服务。以下产品和版本受到影响：Microsoft .NET
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 Microsoft .NET Framework 3.5 3.5.0 ~ 2.0.50727.8982 & 3.0.30729.8976 -
Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 4.7.0 ~ 2.0.50727.9068 & 3.0.30729.9065 & 4.7.4141.0 -
Microsoft Microsoft .NET Framework 3.5 AND 4.8 4.8.0 ~ 2.0.50727.9068 & 3.0.30729.9065 & 4.8.4801.0 -
Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 4.8.1 ~ 2.0.50727.9181 & 3.0.30729.9165 & 4.8.9332.0 -
Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.0 ~ 4.8.4801.0 -
Microsoft Microsoft .NET Framework 4.8 4.8.0 ~ 4.8.4801.0 -

II. Public POCs for CVE-2026-23666

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III. Intelligence Information for CVE-2026-23666

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Same Patch Batch · Microsoft · 2026-04-14 · 163 CVEs total

CVE-2026-33824 9.8 CRITICAL Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability
CVE-2026-26149 9.0 CRITICAL Microsoft Power Apps Desktop Client Spoofing Vulnerability
CVE-2026-26178 8.8 HIGH Windows Advanced Rasterization Platform Elevation of Privilege Vulnerability
CVE-2026-33120 8.8 HIGH Microsoft SQL Server Remote Code Execution Vulnerability
CVE-2026-32157 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-32171 8.8 HIGH Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-32225 8.8 HIGH Windows Shell Security Feature Bypass Vulnerability
CVE-2026-26167 8.8 HIGH Windows Push Notifications Elevation of Privilege Vulnerability
CVE-2026-27928 8.7 HIGH Windows Hello Security Feature Bypass Vulnerability
CVE-2026-33115 8.4 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2026-32221 8.4 HIGH Windows Graphics Component Remote Code Execution Vulnerability
CVE-2026-32091 8.4 HIGH Microsoft Brokering File System Elevation of Privilege Vulnerability
CVE-2026-32162 8.4 HIGH Windows COM Elevation of Privilege Vulnerability
CVE-2026-32190 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-33114 8.4 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2026-33827 8.1 HIGH Windows TCP/IP Remote Code Execution Vulnerability
CVE-2026-33826 8.0 HIGH Windows Active Directory Remote Code Execution Vulnerability
CVE-2026-27912 8.0 HIGH Windows Kerberos Elevation of Privilege Vulnerability
CVE-2026-33098 7.8 HIGH Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
CVE-2026-32222 7.8 HIGH Windows Win32k Elevation of Privilege Vulnerability

Showing top 20 of 163 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft .NET Framework 3.5
Same vendor: Microsoft
Same weakness: CWE-755

V. Comments for CVE-2026-23666

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