Microsoft Office February Security Updates Patch Sharepoint, Excel RCE Bugs
Microsoft has addressed important severity remote code execution vulnerabilities affecting multiple Office products in the January 2021 Office security updates.
In total, the company released 26 security updates and 5 cumulative updates for 7 different products, fixing 11 vulnerabilities that could allow attackers to escalate privileges or execute arbitrary code remotely on systems running vulnerable software.
This Patch Tuesday, Microsoft also issued several SharePoint non-security updates, as well as fixed separate issues affecting the Microsoft 365 Apps version of Outlook.
Microsoft also released non-security Office updates last week addressing bugs that may lead to PowerPoint crashes and other issues affecting Windows Installer (MSI) editions of Office 2016, Office 2013, and Office 2010 products.
The company issued the February 2021 Patch Tuesday updates yesterday, with patches for a Windows Win32k elevation of privilege zero-day exploited in the wild and 56 other security vulnerabilities, 11 of them classified as critical severity.
Additionally, Microsoft urged customers to install security updates for three critical and high severity Windows TCP/IP security bugs as soon as possible due to the elevated exploitation risk and potential denial-of-service (DoS) attacks that could soon target unpatched systems.
Non-security Windows updates were delivered to Windows 10 customers with the KB4601315 and KB4601319 cumulative updates.
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Patched Office security vulnerabilities
This month’s Office security updates address bugs exposing Windows systems running vulnerable Click to Run and Microsoft Installer (.msi)-based editions of Microsoft Office products to remote code execution (RCE), information disclosure, and spoofing attacks.
Microsoft rated the six RCE bugs patched in February 2021 as Important severity issues given that they could enable attackers to execute arbitrary code in the context of the currently logged-in user.
Following successful exploitation, attackers could install malicious programs, view, change, and delete data, as well as make their own admin accounts on exploited Windows devices.
| Tag | CVE ID | CVE Title | Severity |
| Microsoft Office Excel | CVE-2021-24067 | Microsoft Excel Remote Code Execution Vulnerability | Important |
| Microsoft Office Excel | CVE-2021-24068 | Microsoft Excel Remote Code Execution Vulnerability | Important |
| Microsoft Office Excel | CVE-2021-24069 | Microsoft Excel Remote Code Execution Vulnerability | Important |
| Microsoft Office Excel | CVE-2021-24070 | Microsoft Excel Remote Code Execution Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-24071 | Microsoft SharePoint Information Disclosure Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-1726 | Microsoft SharePoint Spoofing Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-24066 | Microsoft SharePoint Remote Code Execution Vulnerability | Important |
| Microsoft Office SharePoint | CVE-2021-24072 | Microsoft SharePoint Server Remote Code Execution Vulnerability | Important |
February 2021 Microsoft Office security updates
Microsoft Office security updates can be installed through the Microsoft Update platform or via Microsoft’s Download Center.
More information about each Office security update issued this month is available within the knowledge base articles linked in the table below.
To download the February 2021 Microsoft Office security updates, you have to click on the corresponding knowledge base article below and then scroll down to the ‘How to download and install the update‘ section.
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