October 18, 2022—KB5020440 (OS Build 10240.19509) Out-of-band
Highlights
We address an issue that might affect some types of Secure Sockets Layer (SSL) and Transport Layer Security (TLS) connections. These connections might have handshake failures. For developers, the affected connections are likely to receive one or more records followed by a partial record with a size of less than 5 bytes within a single input buffer. If the connection fails, your app will receive the error, “SEC_E_ILLEGAL_MESSAGE”.
Improvements
This non-security update includes quality improvements. Key changes include:
We address an issue that might affect some types of Secure Sockets Layer (SSL) and Transport Layer Security (TLS) connections. These connections might have handshake failures. For developers, the affected connections are likely to receive one or more records followed by a partial record with a size of less than 5 bytes within a single input buffer. If the connection fails, your app will receive the error, “SEC_E_ILLEGAL_MESSAGE”.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
How to get this update
Before installing this update
Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security updates. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
If you are using Windows Update, the latest SSU ( KB5014024) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.
October 18, 2022—KB5020440 (OS Build 10240.19509) Out-of-band
Microsoft has released KB5020440 (OS Build 10240.19509) Out-of-band update for Windows 10.
