A buffer overflow vulnerability exists in Microsoft SQL Server that could allow remote code execution on an affected system. An attacker who successfully exploits this vulnerability could execute code in the context of the SQL Server Database Engine service account.
To learn more about the vulnerability, see CVE-2018-8273.
This update is a replacement for the update KB4293807 that was released on August 14, 2018. If you have previously applied the original update KB4293807, we recommend that you install the update KB4458621 as soon as possible.
How to obtain and install the update
Method 1: Windows Update
This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Windows Update: FAQ.
Method 2: Microsoft Update Catalog
Method 3: Microsoft Download Center
The following file is available for download from the Microsoft Download Center:
Download the package now
Release Date: August 21, 2018
For more information about how to download Microsoft support files, click the following article number to go to the article in the Microsoft Knowledge Base:
Microsoft scanned this file for viruses by using the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Important 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.
File hash information
|File name||SHA1 hash||SHA256 hash|
The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.