KB5020387 Windows 11 21H2 Out-of-Band Update

KB5020387 Windows 11 21H2 Out of Band Update
KB5020387 Windows 11 21H2 Out of Band Update

Microsoft has released a new out-of-band update for Windows 11 21H2 with KB number KB5020387 to the public. The update brings the following changes:

  • 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”.

After installing the new update KB5020387, your build number will be increased to 22000.1100.

Download: x64-KB5020387
Download: arm-KB5020387