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October 14, 2025-KB5066131 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 and Microsoft server operating system version 24H2

🗓️ 14 Oct 2025 14:00:00Reported by MicrosoftType 
mskb
 mskb🔗 support.microsoft.com👁 20 Views

This security update for .NET Framework 3.5 and 4.8.1 on Windows 11 24H2 and Windows Server 24H2 fixes CVE-2025-55248.

Related
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Tenable Nessus		Amazon Linux 2023 : aspnetcore-runtime-8.0, aspnetcore-runtime-dbg-8.0, aspnetcore-targeting-pack-8.0 (ALAS2023-2025-1230)
23 Oct 202500:00
–nessus
Tenable Nessus		Amazon Linux 2023 : aspnetcore-runtime-9.0, aspnetcore-runtime-dbg-9.0, aspnetcore-targeting-pack-9.0 (ALAS2023-2025-1231)
23 Oct 202500:00
–nessus
Tenable Nessus		AlmaLinux 8 : .NET 8.0 (ALSA-2025:18148)
21 Oct 202500:00
–nessus
Tenable Nessus		AlmaLinux 9 : .NET 8.0 (ALSA-2025:18149)
21 Oct 202500:00
–nessus
Tenable Nessus		AlmaLinux 8 : .NET 9.0 (ALSA-2025:18150)
3 Nov 202500:00
–nessus
Tenable Nessus		AlmaLinux 9 : .NET 9.0 (ALSA-2025:18151)
3 Nov 202500:00
–nessus
Tenable Nessus		AlmaLinux 10 : .NET 8.0 (ALSA-2025:18152)
3 Nov 202500:00
–nessus
Tenable Nessus		AlmaLinux 10 : .NET 9.0 (ALSA-2025:18153)
3 Nov 202500:00
–nessus
Tenable Nessus		MiracleLinux 8 : dotnet9.0-9.0.111-1.el8_10 (AXSA:2025-10972:22)
13 Jan 202600:00
–nessus
Tenable Nessus		MiracleLinux 9 : dotnet9.0-9.0.111-1.el9_6.ML.1 (AXSA:2025-10978:23)
13 Jan 202600:00
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14 Oct 2025 14:00Current
6Medium risk
Vulners AI Score6
CVSS 3.14.8 - 5.7
EPSS0.0003
SSVC
dotnet framework 3.5dotnet framework 4.8.1windows eleven 24h2windows server 24h2information disclosuresecurity update
20