Windows 10 version 1809 has a security update, but you have to install it manually

Windows 10 version 1809 may have reached its end of support earlier this month, but Microsoft has another update for it. The update brings Windows 10 to build 177.63.1579.

The update has just a single highlight, which is outlined on a Microsoft support page:

• Updates an issue that might cause Kerberos authentication and ticket renewal issues that are related to the implementation of CVE-2020-17049.

The update also includes a few improvements and fixes:

• Addresses issues with Kerberos authentication related to the PerformTicketSignature registry subkey value in CVE-2020-17049, which was a part of the November 10, 2020 Windows update. The following issues might occur on writable and read-only domain controllers (DC):
• Kerberos service tickets and ticket-granting tickets (TGT) might not renew for non-Windows Kerberos clients when PerformTicketSignature is set to 1 (the default).
• Service for User (S4U) scenarios, such as scheduled tasks, clustering, and services for line-of-business applications, might fail for all clients when PerformTicketSignature is set to 0.
• S4UProxy delegation fails during ticket referral in cross-domain scenarios if DCs in intermediate domains are inconsistently updated and PerformTicketSignature is set to 1.

As pointed out by Neowin, this build is not available through Windows Update. Instead, you have to manually install it through Microsoft Update Catalog.