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add 4b release notes (#45660)
* add 4b release notes * Apply suggestions from code review --------- Co-authored-by: Bill Wagner <[email protected]>
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‎docs/framework/release-notes/2025/04-08-april-cumulative-update.md

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---
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title: April 2025 security and quality rollup
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description: Learn about the improvements in the .NET Framework April 2025 security and quality rollup.
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ms.date: 04/08/2025
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---
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# April 2025 security and quality rollup
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_Released April 8, 2025_
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## Summary of what's new in this release
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- [Security improvements](#security-improvements)
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- [Quality and reliability improvements](#quality-and-reliability-improvements)
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### Security improvements
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There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements.
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### Quality and reliability improvements
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This release contains the following quality and reliability improvements.
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#### CLR
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Addresses an issue where System.IO APIs are used to operate on files and directories on UNC shares. (*Applies to: .NET Framework 4.8, 4.8.1.*)
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#### WPF
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Addresses an issue with printing large number of pages due to an OutOfMemory exception. (*Applies to: .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1.*)
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## Known issues
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This release contains no known issues.
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## Summary tables
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| Product version | Cumulative update |
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| --- | --- |
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| **Windows 11, version 24H2** | |
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| .NET Framework 3.5, 4.8.1 | [5054979](https://support.microsoft.com/kb/5054979) |
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| **Microsoft server operating system, version 24H2** | |
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| .NET Framework 3.5, 4.8.1 | [5054979](https://support.microsoft.com/kb/5054979) |
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| **Microsoft server operating system, version 23H2** | |
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| .NET Framework 3.5, 4.8.1 | [5054705](https://support.microsoft.com/kb/5054705) |
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| **Windows 11, version 22H2 and Windows 11, version 23H2** | |
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| .NET Framework 3.5, 4.8.1 | [5054980](https://support.microsoft.com/kb/5054980) |
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| **Microsoft server operating system, version 22H2** | **[5055688](https://support.microsoft.com/kb/5055688)** |
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| .NET Framework 3.5, 4.8 | [5055169](https://support.microsoft.com/kb/5055169) |
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| .NET Framework 3.5, 4.8.1 | [5054693](https://support.microsoft.com/kb/5054693) |
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| **Microsoft server operating system, version 21H2** | **[5055688](https://support.microsoft.com/kb/5055688)** |
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| .NET Framework 3.5, 4.8 | [5055169](https://support.microsoft.com/kb/5055169) |
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| .NET Framework 3.5, 4.8.1 | [5054693](https://support.microsoft.com/kb/5054693) |
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| **Windows 10, version 22H2** | **[5055683](https://support.microsoft.com/kb/5055683)** |
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| .NET Framework 3.5, 4.8 | [5054977](https://support.microsoft.com/kb/5054977) |
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| .NET Framework 3.5, 4.8.1 | [5054978](https://support.microsoft.com/kb/5054978) |
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| **Windows 10, version 21H2** | **[5055683](https://support.microsoft.com/kb/5055683)** |
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| .NET Framework 3.5, 4.8 | [5054977](https://support.microsoft.com/kb/5054977) |
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| .NET Framework 3.5, 4.8.1 | [5054978](https://support.microsoft.com/kb/5054978) |
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| **Windows 10 1809 and Windows Server 2019** | **[5055681](https://support.microsoft.com/kb/5055681)** |
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| .NET Framework 3.5, 4.7.2 | [5054695](https://support.microsoft.com/kb/5054695) |
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| .NET Framework 3.5, 4.8 | [5055175](https://support.microsoft.com/kb/5055175) |
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| **Windows 10 1607 and Windows Server 2016** | |
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| .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2 | [5055521](https://support.microsoft.com/kb/5055521) |
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| .NET Framework 4.8 | [5055170](https://support.microsoft.com/kb/5055170) |
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The following table is for earlier Windows and Windows Server versions for Security and Quality Rollup updates.  
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| Product version | Security and quality rollup |
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| --- | --- |
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| **Windows Server 2012 R2** | **[5055686](https://support.microsoft.com/kb/5055686)** |
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| .NET Framework 3.5 | [5044012](https://support.microsoft.com/kb/5044012) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5054698](https://support.microsoft.com/kb/5054698) |
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| .NET Framework 4.8 | [5055173](https://support.microsoft.com/kb/5055173) |
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| **Windows Server 2012** | **[5055685](https://support.microsoft.com/kb/5055685)** |
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| .NET Framework 3.5 | [5044009](https://support.microsoft.com/kb/5044009) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5054697](https://support.microsoft.com/kb/5054697) |
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| .NET Framework 4.8 | [5055172](https://support.microsoft.com/kb/5055172) |
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| **Windows Server 2008 R2** | **[5055684](https://support.microsoft.com/kb/5055684)** |
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| .NET Framework 3.5.1 | [5044011](https://support.microsoft.com/kb/5044011) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5054696](https://support.microsoft.com/kb/5054696) |
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| .NET Framework 4.8 |[5055171](https://support.microsoft.com/kb/5055171) |
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| **Windows Server 2008** | **[5055687](https://support.microsoft.com/kb/5055687)** |
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| .NET Framework 2.0, 3.0 | [5044010](https://support.microsoft.com/kb/5044010) |
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| .NET Framework 3.5 SP1 | [5040673](https://support.microsoft.com/kb/5040673) |
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| .NET Framework 4.6.2 | [5054696](https://support.microsoft.com/kb/5054696) |
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The operating system row lists a KB which will be used for update offering purposes. When the operating system KB is offered, the applicability logic will determine the specific .NET Framework update(s) will be installed. Updates for individual .NET Framework versions will be installed based on the version of .NET Framework that is already present on the device. Because of this the operating system KB is not expected to be listed as installed updates on the device. The expected update to be installed are the .NET Framework specific version updates listed in the table above.

‎docs/framework/release-notes/release-notes.md

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.NET Framework cumulative update releases are discussed in detail in the following individual release notes:
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* March 25, 2025 - [cumulative update preview](./2025/03-25-march-cumulative-update-preview.md) **New Release**
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* April 8, 2025 - [cumulative update](./2025/04-08-april-cumulative-update.md) **New Release**
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* March 25, 2025 - [cumulative update preview](./2025/03-25-march-cumulative-update-preview.md)
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* January 28, 2025 - [cumulative update preview](./2025/01-28-january-cumulative-update-preview.md)
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* January 14, 2025 - [cumulative update](./2025/01-14-january-cumulative-update.md)
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* November 21, 2024 - [cumulative update preview](./2024/11-21-november-preview-cumulative-update.md)

‎docs/framework/toc.yml

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href: release-notes/2025/01-28-january-cumulative-update-preview.md
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- name: March 2025 cumulative update preview
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href: release-notes/2025/03-25-march-cumulative-update-preview.md
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- name: April 2025 cumulative update
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href: release-notes/2025/04-08-april-cumulative-update.md
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- name: What's new
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href: whats-new/index.md
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- name: What's new in accessibility

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