Learn more about this security-only update, including improvements, any known issues, and how to get the update.
REMINDER Windows Server 2012 has reached the end of mainstream support and is now in extended support. Starting in July 2020, there will no longer be optional releases (known as "C" or "D" releases) for this operating system. Operating systems in extended support have only cumulative monthly security updates (known as the "B" or Update Tuesday release).
Verify that you have installed the required updates listed in the How to get this update section before installing this update.
This security-only update includes key changes for the following issue:
Addresses an issue that leads to User Datagram Protocol (UDP) packet drops from Linux virtual machines (VMs).
Updates daylight saving time (DST) in Chile to start on September 11, 2022 instead of September 4, 2022.
Addresses a known issue in which file copies which use Group Policy Preferences might fail or might create empty shortcuts or files that have 0 (zero) bytes.
Known issues in this update
On October 5, 2022, the Jordanian government made an official announcement ending the winter-time Daylight Saving Time (DST) time zone change. Starting at 12:00 a.m. Friday, October 28, 2022, the official time will not advance by an hour and will permanently shift to the UTC + 3 time zone.
The impact of this change is as follows:
Symptoms if no update is installed and the workaround is not used on devices in the Jordan time zone on October 28, 2022 or later:
This issue is addressed in KB5020003. This update will not install automatically. To apply this update, you can check for updates and select the optional preview to download and install.
If you cannot install this update, you can mitigate this issue on devices in Jordan by doing either of the following on October 28, 2022:
Important We recommend using ONLY the above workaround to mitigate the issue with time created by the new Daylight Savings Time in Jordan. We do NOT recommend using any other workaround, as they can create inconsistent results and might create serious issues if done incorrectly.
After this update or a later Windows update is installed, domain join operations might be unsuccessful and error "0xaac (2732): NERR_AccountReuseBlockedByPolicy" occurs. Additionally, text stating "An account with the same name exists in Active Directory. Re-using the account was blocked by security policy" might be displayed.
Affected scenarios include some domain join or re-imaging operations where a computer account was created or pre-staged by a different identity than the identity used to join or re-join the computer to the domain.
For more information about this issue, see KB5020276—Netjoin: Domain join hardening changes.
Note Consumer Desktop editions of Windows are unlikely to experience this issue.
Please see KB5020276 for guidance on this issue.
After installing this update, some types of Secure Sockets Layer (SSL) and Transport Layer Security (TLS) connections might have handshake failures.
Note for developers: Affected connections might send multiple frames in a single input buffer. Specifically, one or more complete records with a partial record that is less than 5 bytes might be sent in a single buffer.
When encountering this issue, your app will receive SEC_E_ILLEGAL_MESSAGE when the connection fails.
To address this issue, install update KB5020449. Then, we recommend that you install the latest security update for your device.
How to get this update
Before installing this update
We strongly recommend that you install the latest servicing stack update (SSU) for your operating system before installing the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
REMINDER If you are using Security-only updates, you will also need to install all previous Security-only updates and the latest cumulative update for Internet Explorer (KB5018413).
If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.
Install this update
Windows Update and Microsoft Update
See the other options below.
Microsoft Update Catalog
To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)
This update will automatically sync with WSUS if you configure Products and Classifications as follows:
Product: Windows Server 2012, Windows Embedded 8 Standard
Classification: Security Update
For a list of the files that are provided in this update, download the file information for update KB5018478.
Learn about the standard terminology that is used to describe Microsoft software updates.