7.5

CVE-2026-23666

Medienbericht

.NET Framework Denial of Service Vulnerability

Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Microsoft ≫ .Net Framework Version 3.5 Update -
   Microsoft ≫ Windows Server 2012 Version -
   Microsoft ≫ Windows Server 2012 Version r2
Microsoft ≫ .Net Framework Version 3.5 Update -
   Microsoft ≫ Windows 10 1809 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x86
Microsoft ≫ .Net Framework Version 4.7.2
   Microsoft ≫ Windows 10 1809 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x86
Microsoft ≫ .Net Framework Version 3.5 Update -
   Microsoft ≫ Windows 10 1809 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x86
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x86
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x86
   Microsoft ≫ Windows Server 2022 Version -
Microsoft ≫ .Net Framework Version 4.8
   Microsoft ≫ Windows 10 1809 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x64
   Microsoft ≫ Windows 10 1809 Version - HwPlatform x86
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x86
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x86
   Microsoft ≫ Windows Server 2022 Version -
Microsoft ≫ .Net Framework Version 3.5 Update -
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x86
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x86
   Microsoft ≫ Windows 11 22h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 22h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 23h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 23h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 24h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 24h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 25h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 25h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 26h1 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 26h1 Version - HwPlatform x64
   Microsoft ≫ Windows Server 2022 Version -
   Microsoft ≫ Windows Server 2022 23h2 Version - HwPlatform x64
   Microsoft ≫ Windows Server 2025 Version - HwPlatform x64
Microsoft ≫ .Net Framework Version 4.8.1
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 21h2 Version - HwPlatform x86
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x64
   Microsoft ≫ Windows 10 22h2 Version - HwPlatform x86
   Microsoft ≫ Windows 11 22h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 22h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 23h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 23h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 24h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 24h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 25h2 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 25h2 Version - HwPlatform x64
   Microsoft ≫ Windows 11 26h1 Version - HwPlatform arm64
   Microsoft ≫ Windows 11 26h1 Version - HwPlatform x64
   Microsoft ≫ Windows Server 2022 Version -
   Microsoft ≫ Windows Server 2022 23h2 Version - HwPlatform x64
   Microsoft ≫ Windows Server 2025 Version - HwPlatform x64
Microsoft ≫ .Net Framework Version 4.6.2
   Microsoft ≫ Windows Server 2012 Version -
   Microsoft ≫ Windows Server 2012 Version r2
Microsoft ≫ .Net Framework Version 4.7
   Microsoft ≫ Windows Server 2012 Version -
   Microsoft ≫ Windows Server 2012 Version r2
Microsoft ≫ .Net Framework Version 4.7.1
   Microsoft ≫ Windows Server 2012 Version -
   Microsoft ≫ Windows Server 2012 Version r2
Microsoft ≫ .Net Framework Version 4.7.2
   Microsoft ≫ Windows Server 2012 Version -
   Microsoft ≫ Windows Server 2012 Version r2
Microsoft ≫ .Net Framework Version 4.8
   Microsoft ≫ Windows 10 1607 Version - HwPlatform x64
   Microsoft ≫ Windows 10 1607 Version - HwPlatform x86
   Microsoft ≫ Windows Server 2012 Version -
   Microsoft ≫ Windows Server 2012 Version r2
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.33% 0.675
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Microsoft 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-366 Race Condition within a Thread

If two threads of execution use a resource simultaneously, there exists the possibility that resources may be used while invalid, in turn making the state of execution undefined.

CWE-755 Improper Handling of Exceptional Conditions

The product does not handle or incorrectly handles an exceptional condition.

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VulnDex Intel
Media Report
14.04.2026 19:52
https://bugzilla.redhat.com/show_bug.cgi?id=2458271
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23666.json
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-23666