Office January security updates fix remote code execution bugs

Microsoft addresses important severity remote code execution vulnerabilities affecting multiple Office products in the January 2021 Office security updates released during this month’s Patch Tuesday.

In total, this month 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.

A separate crash problem affecting the Microsoft 365 Apps version of Excel when using certain Windows Security exploit protection settings was also fixed this week.

Microsoft also released non-security Microsoft Office updates last week addressing recurrent Outlook crashes and other issues impacting Windows Installer (MSI) editions of Office 2016 products.

The company also issued the January 2021 Patch Tuesday, with patches for a Microsoft Defender antivirus zero-day exploited in the wild and 83 additional security vulnerabilities, ten of them rated as critical.

Non-security Windows updates were also released on Tuesday with the Windows 10 KB4598229 and KB4598242 cumulative updates.

List of patched Office security vulnerabilities

Office security updates published as part of the January 2021 Patch Tuesday 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) attacks.

Microsoft rated the six RCE bugs patched this month as Important severity issues since they could enable attackers to execute arbitrary code in the context of the currently logged-in user.

After successful exploitation, the attackers could install malicious programs, view, change, and delete data, as well as create their own admin accounts on compromised Windows devices.

Tag CVE ID CVE Title Severity
Microsoft Office CVE-2021-1713 Microsoft Excel Remote Code Execution Vulnerability Important
Microsoft Office CVE-2021-1714 Microsoft Excel Remote Code Execution Vulnerability Important
Microsoft Office CVE-2021-1711 Microsoft Office Remote Code Execution Vulnerability Important
Microsoft Office CVE-2021-1715 Microsoft Word Remote Code Execution Vulnerability Important
Microsoft Office CVE-2021-1716 Microsoft Word Remote Code Execution Vulnerability Important
Microsoft Office SharePoint CVE-2021-1712 Microsoft SharePoint Elevation of Privilege Vulnerability Important
Microsoft Office SharePoint CVE-2021-1707 Microsoft SharePoint Server Remote Code Execution Vulnerability Important
Microsoft Office SharePoint CVE-2021-1718 Microsoft SharePoint Server Tampering Vulnerability Important
Microsoft Office SharePoint CVE-2021-1717 Microsoft SharePoint Spoofing Vulnerability Important
Microsoft Office SharePoint CVE-2021-1719 Microsoft SharePoint Elevation of Privilege Vulnerability Important
Microsoft Office SharePoint CVE-2021-1641 Microsoft SharePoint Spoofing Vulnerability Important

January 2021 Microsoft Office security updates

Microsoft Office security updates are delivered through the Microsoft Update platform and via the Download Center.

Further information about each of them is available within the knowledge base articles linked below.

To download the January 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.

Microsoft Office 2016

Microsoft Office 2013

Microsoft Office 2010

Microsoft SharePoint Server 2019

Microsoft SharePoint Server 2016

Microsoft SharePoint Server 2013

Microsoft SharePoint Server 2010



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