AlertsMicrosoft Security Advisory – October 2021 Monthly Rollup

Number: AV21-513
Date: 12 October 2021

On 12 October 2021 Microsoft published Security Updates to address vulnerabilities in multiple products. Included were critical updates for the following:

  • Windows 10 and 11
  • Windows Server Core version 20H2, version 2004, 2019 and 2022
  • Windows Server 2019 and 2022
  • Microsoft Word 2013 RT SP1, 2013 SP1 and 2016
  • Microsoft Office 2019, Online Server, and Web Apps Server 2013 SP1
  • Microsoft SharePoint Enterprise Server 2013 SP1 and 2016
  • Microsoft SharePoint Server 2019

Exploitation of some of these vulnerabilities could allow an actor to execute code remotely.

Of note, Microsoft has indicated that exploitation has been detected for the following vulnerability: CVE-2021-40449.

The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.

October 2021 Release Notes

Security Update Guide

Note to Readers 

The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment.  We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure, Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.

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