October 2025 Patch Tuesday: Microsoft’s Latest Security Updates
As we mark the second Tuesday of October, it’s that time once again—Patch Tuesday. Microsoft is rolling out its monthly security updates, commonly referred to as the “B release, ” for October 2025. This release affects Windows Server 20H2 and the most recent supported versions of Windows 10, namely 20H2, 21H2, and 22H2.
This month’s updates, cataloged under KB5066791, elevate the build numbers to 19044.6456 and 19045.6456. For those looking to download the standalone updates, they are available on the Microsoft Update Catalog through this link. Notably, this will also be the final patch for Windows 10, as support for the OS officially ends today.
Key Enhancements and Fixes in the Update
The primary focus of this update is to fortify system security and resolve various bugs. Below is a summary of the critical changes:
[Input and Composition]
- Resolved an issue within the Chinese Input Method Editor (IME) that incorrectly displayed private Unicode characters, failing to comply with the GB18030 standard.
- Addressed a problem affecting USER32 Edit controls where surrogate pairs were shown as empty boxes upon reaching field length limits.
[Windows Remote Management (WinRM)]
- Fixed a timing issue affecting PowerShell Remoting and WinRM, which caused commands to timeout after 600 seconds.
[Licensing]
- New Feature: This release introduces a servicing stack update (SSU) aimed at enhancing the certificate chain for better validation within Azure environments. Additional details can be found in the servicing stack update section.
[Fax Modem Driver]
- Removal of the ltmdm64.sys driver, resulting in the ineffectiveness of any fax modem hardware reliant on this driver in Windows.
It’s important to note that this update brings known issues related to Noto fonts.
Updates for Older Windows Versions
Alongside the primary updates, older versions of Windows 10 also received patches today. Below are the details for these versions, including their respective release notes (KB) and download links from the Microsoft Update Catalog:
| Version | KB | Build | Download | Support |
|---|---|---|---|---|
| 1809 | KB5065428 | 17763.7792 | Update Catalog | Long-Term Servicing Channel (LTSC) |
| 1607 | KB5065427 | 14393.8422 | Update Catalog | |
| 1507 | KB5065430 | 10240.21128 | Update Catalog |
As a reminder, Windows 10 versions 20H2 and 1909 have officially reached their end of servicing. Additionally, non-LTSC editions of 21H2 have reached the same milestone.
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