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add September and October release notes (#49085)
* add september and october release notes correct typo in January release notes add September release notes add October release notes add details to TOC and release notes index * Update docs/framework/release-notes/release-notes.md Co-authored-by: Copilot <[email protected]> * Update docs/framework/release-notes/2025/10-14-october-cumulative-update.md Co-authored-by: Copilot <[email protected]> * Fix link for .NET Framework 4.6.2 updates * Fix link for .NET Framework 4.6.2 to 4.7.2 update * Fix links for .NET Framework update references * Update docs/framework/release-notes/2025/09-09-september-cumulative-update.md Co-authored-by: Genevieve Warren <[email protected]> * Update docs/framework/release-notes/2025/10-14-october-cumulative-update.md Co-authored-by: Genevieve Warren <[email protected]> --------- Co-authored-by: Copilot <[email protected]> Co-authored-by: Genevieve Warren <[email protected]>
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‎docs/framework/release-notes/2025/01-14-january-cumulative-update.md‎

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| .NET Framework 4.8 | [5049614](https://support.microsoft.com/kb/5049614) |
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| **Windows Server 2012** | **[5050184](https://support.microsoft.com/kb/5050184)** |
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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 | [55049609](https://support.microsoft.com/kb/5049610) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5049609](https://support.microsoft.com/kb/5049609) |
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| .NET Framework 4.8 | [5049618](https://support.microsoft.com/kb/5049618) |
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| **Windows Server 2008 R2** | **[5046543](https://support.microsoft.com/kb/5046543)** |
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| .NET Framework 3.5.1 | [5044011](https://support.microsoft.com/kb/5044011) |

‎docs/framework/release-notes/2025/09-09-september-cumulative-update.md‎

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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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#### ASP.NET
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Addressed an issue in ASP.NET where some error events fail to log properly in the Windows Event log. (*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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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 | [5064401](https://support.microsoft.com/topic/august-28-2025-kb5064401-cumulative-update-for-net-framework-3-5-and-4-8-1-for-windows-11-version-24h2-and-microsoft-server-operating-system-version-24h2-71f4180b-3364-4d0e-8032-e8aca043b0fe) |
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| .NET Framework 3.5, 4.8.1 | [5064401](https://support.microsoft.com/kb/5064401) |
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| **Microsoft server operating system, version 24H2** | |
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| .NET Framework 3.5, 4.8.1 | [5064401](https://support.microsoft.com/kb/5064401) |
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| **Microsoft server operating system, version 23H2** | |
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| .NET Framework 3.5, 4.8.1 | [5065756](https://support.microsoft.com/kb/5065756) |
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| **Windows 11, version 22H2 and Windows 11, version 23H2** | |
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| .NET Framework 3.5, 4.8.1 | [5064403](https://support.microsoft.com/kb/5064403) |
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| **Microsoft server operating system, version 22H2** | **[5065962](https://support.microsoft.com/topic/september-9-2025-kb5065962-cumulative-update-for-net-framework-3-5-4-8-and-4-8-1-for-windows-server-2022-55389349-2511-4062-ba42-aa3434986582)** |
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| **Microsoft server operating system, version 22H2** | **[5065962](https://support.microsoft.com/kb/5065962)** |
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| .NET Framework 3.5, 4.8 | [5065748](https://support.microsoft.com/kb/5065748) |
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| .NET Framework 3.5, 4.8.1 | [5065753](https://support.microsoft.com/kb/5065753) |
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| **Microsoft server operating system, version 21H2** | **[5065962](https://support.microsoft.com/kb/5065962)** |
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| .NET Framework 3.5, 4.8 | [5065748](https://support.microsoft.com/kb/5065748) |
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| .NET Framework 3.5, 4.8.1 | [5065753](https://support.microsoft.com/kb/5065753) |
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| **Windows 10, version 22H2** | **[5065956](https://support.microsoft.com/kb/5065956)** |
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| **Windows 10, version 22H2** | **[5065957](https://support.microsoft.com/kb/5065957)** |
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| .NET Framework 3.5, 4.8 | [5064399](https://support.microsoft.com/kb/5064399) |
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| .NET Framework 3.5, 4.8.1 | [5064400](https://support.microsoft.com/kb/5064400) |
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| **Windows 10, version 21H2** | **[5065956](https://support.microsoft.com/kb/5065956)** |
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| **Windows 10 1809 and Windows Server 2019** | **[5065955](https://support.microsoft.com/kb/5065955)** |
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| .NET Framework 3.5, 4.7.2 | [5065744](https://support.microsoft.com/kb/5065744) |
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| .NET Framework 3.5, 4.8 | [5065755](https://support.microsoft.com/kb/5065755) |
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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 | [5065427](https://support.microsoft.com/kb/5065427) |
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| .NET Framework 4.8 | [5065749](https://support.microsoft.com/kb/5065749) |
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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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| .NET Framework 4.8 | [5065752](https://support.microsoft.com/kb/5065752) |
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| **Windows Server 2012** | **[5065959](https://support.microsoft.com/kb/5065959)** |
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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 | [5065746](https://support.microsoft.com/kb/5065746)|
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5065746](https://support.microsoft.com/kb/5065746) |
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| .NET Framework 4.8 | [5065751](https://support.microsoft.com/kb/5065751) |
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| **Windows Server 2008 R2** | **[5065958](https://support.microsoft.com/kb/5065958)** |
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| .NET Framework 3.5.1 | [5044011](https://support.microsoft/kb/5044011) |
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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 | [5065745](https://support.microsoft.com/kb/5065745) |
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| .NET Framework 4.8 | [5065750](https://support.microsoft.com/kb/5065750) |
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| **Windows Server 2008** | **[5065961](https://support.microsoft.com/kb/5065961)**|
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| .NET Framework 4.8 |[5065750](https://support.microsoft.com/kb/5065750) |
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| **Windows Server 2008** | **[5065961](https://support.microsoft.com/kb/5065961)** |
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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 | [5065745](https://support.microsoft.com/kb/5065745) |

‎docs/framework/release-notes/2025/10-14-october-cumulative-update.md‎

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---
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title: October 2025 cumulative update
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description: Learn about the improvements in the .NET Framework October 2025 cumulative update.
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ms.date: 10/14/2025
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---
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# October 2025 cumulative update
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_Released October 14, 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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#### CVE-2025-21176 – Remote Code Execution vulnerability
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This security update addresses a remote code execution vulnerability detailed in [CVE 2025-21176](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21176).
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### Quality and reliability improvements
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There are no new quality and reliability improvements in this update.
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## Known issues in this release
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This release contains no known issues.
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## Summary tables
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The following table outlines the updates in this release.
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| Product version | Cumulative update |
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| --- | --- |
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| **Windows 11, version 25H2** | |
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| .NET Framework 3.5, 4.8.1 | [5066128](https://support.microsoft.com/kb/5066128) |
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| **Windows 11, version 24H2** | |
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| .NET Framework 3.5, 4.8.1 | [5066131](https://support.microsoft.com/kb/5066131) |
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| **Microsoft server operating system, version 24H2** | |
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| .NET Framework 3.5, 4.8.1 | [5066131](https://support.microsoft.com/kb/5066131) |
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| **Microsoft server operating system, version 23H2** | |
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| .NET Framework 3.5, 4.8.1 | [5066129](https://support.microsoft.com/kb/5066129) |
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| **Windows 11, version 22H2 and Windows 11, version 23H2** | |
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| .NET Framework 3.5, 4.8.1 | [5066133](https://support.microsoft.com/kb/5066133) |
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| **Microsoft server operating system, version 22H2** | **[5066743](https://support.microsoft.com/kb/5066743)** |
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| .NET Framework 3.5, 4.8 | [5066139](https://support.microsoft.com/kb/5066139) |
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| .NET Framework 3.5, 4.8.1 | [5066134](https://support.microsoft.com/kb/5066134) |
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| **Microsoft server operating system, version 21H2** | **[5066743](https://support.microsoft.com/kb/5066743)** |
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| .NET Framework 3.5, 4.8 | [5066139](https://support.microsoft.com/kb/5066139) |
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| .NET Framework 3.5, 4.8.1 | [5066134](https://support.microsoft.com/kb/5066134) |
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| **Windows 10, version 22H2** | **[5066747](https://support.microsoft.com/kb/5066747)** |
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| .NET Framework 3.5, 4.8 | [5066135](https://support.microsoft.com/kb/5066135) |
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| .NET Framework 3.5, 4.8.1 | [5066130](https://support.microsoft.com/kb/5066130) |
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| **Windows 10, version 21H2** | **[5066746](https://support.microsoft.com/kb/5066746)** |
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| .NET Framework 3.5, 4.8 | [5066135](https://support.microsoft.com/kb/5066135) |
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| .NET Framework 3.5, 4.8.1 | [5066130](https://support.microsoft.com/kb/5066130) |
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| **Windows 10 1809 and Windows Server 2019** | **[5066738](https://support.microsoft.com/kb/5066738)** |
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| .NET Framework 3.5, 4.7.2 | [5066143](https://support.microsoft.com/kb/5066143) |
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| .NET Framework 3.5, 4.8 | [5066137](https://support.microsoft.com/kb/5066137) |
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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 | [5066836](https://support.microsoft.com/kb/5066836) |
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| .NET Framework 4.8 | [5066136](https://support.microsoft.com/kb/5066136) |
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| **Windows 10 1507** | |
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| .NET Framework 3.5, 4.6, 4.6.2 | [5066837](https://support.microsoft.com/kb/5066837) |
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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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| **Windows Server 2012 R2** | **[5066741](https://support.microsoft.com/kb/5066741)** |
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| .NET Framework 3.5 | [5066151](https://support.microsoft.com/kb/5066151) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5066145](https://support.microsoft.com/kb/5066145) |
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| .NET Framework 4.8 | [5066140](https://support.microsoft.com/kb/5066140) |
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| **Windows Server 2012** | **[5066740](https://support.microsoft.com/kb/5066740)** |
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| .NET Framework 3.5 | [5066148](https://support.microsoft.com/kb/5066148) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5066144](https://support.microsoft.com/kb/5066144) |
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| .NET Framework 4.8 | [5066138](https://support.microsoft.com/kb/5066138) |
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| **Windows Server 2008 R2** | **[5066739](https://support.microsoft.com/kb/5066739)** |
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| .NET Framework 3.5.1 | [5066150](https://support.microsoft.com/kb/5066150) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5066146](https://support.microsoft.com/kb/5066146)|
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| .NET Framework 4.8 |[5066141](https://support.microsoft.com/kb/5066141) |
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| **Windows Server 2008** | **[5066742](https://support.microsoft.com/kb/5066742)** |
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| .NET Framework 2.0, 3.0 | [5066149](https://support.microsoft.com/kb/5066149) |
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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 | [5066146](https://support.microsoft.com/kb/5066146) |
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| Product version | Security Only Update |
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| **Windows Server 2008 R2** | **[5066748](https://support.microsoft.com/kb/5066748)** |
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| .NET Framework 3.5.1 | [5066728](https://support.microsoft.com/kb/5066728) |
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| .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 | [5066726](https://support.microsoft.com/kb/5066726)|
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| .NET Framework 4.8 |[5066725](https://support.microsoft.com/kb/5066725) |
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| **Windows Server 2008** | **[5066749](https://support.microsoft.com/kb/5066749)** |
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| .NET Framework 2.0, 3.0 | [5066727](https://support.microsoft.com/kb/5066727) |
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| .NET Framework 4.6.2 | [5066726](https://support.microsoft.com/kb/5066726) |
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The operating system rows list a KB that's used for update-offering purposes. When the operating system KB is offered, the applicability logic determines the specific .NET Framework updates that will be installed. Updates for individual .NET Framework versions are installed based on the version of .NET Framework that's already present on the device. Because of this, the operating system KB is not expected to be listed as an installed update on the device. The expected updates to be installed are the .NET Framework specific version updates listed in the preceding table.

‎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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* September 9, 2025 - [cumulative update](./2025/09-09-september-cumulative-update.md) **New Release**
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* October 14, 2025 - [cumulative update preview](./2025/10-14-october-cumulative-update.md) **New Release**
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* September 9, 2025 - [cumulative update preview](./2025/09-09-september-cumulative-update.md)
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* August 26, 2025 - [cumulative update preview](./2025/08-26-august-cumulative-update-preview.md)
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* July 8, 2025 - [cumulative update](./2025/07-08-july-cumulative-update.md)
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* April 22, 2025 - [cumulative update preview](./2025/04-22-april-cumulative-update-preview.md)

‎docs/framework/toc.yml‎

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- name: September 2025 cumulative update
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- name: October 2025 cumulative update
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- name: What's new
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- name: What's new in accessibility

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