Microsoft patches actively exploited Exchange, Excel zero-days (CVE-2021-42321, CVE-2021-42292)

It’s a light November 2021 Patch Tuesday from Microsoft: 55 fixed CVEs, of which two are zero-days under active exploitation: CVE-2021-42321, a Microsoft Exchange RCE, and CVE-2021-42292, a Microsoft Excel security feature bypass bug.

CVE-2021-42321, the remote code execution vulnerability in Microsoft Exchange Server 2016 and 2019, is due to issues with the validation of command-let arguments.

In a blog post published by the Exchange Team, the company recommended that the provided updates for Microsoft Exchange be installed immediately.

The in-the-wild exploitation of CVE-2021-42292, the Microsoft Excel security feature bypass zero-day, was apparently discovered by Microsoft’s Security Threat Intelligence Center.

CVE-2021-42298, a Microsoft Defender RCE hole that will be plugged automatically on internet-connected systems when they receive the malware definition updates and the update for the Microsoft Malware Protection Engine.

CVE-2021-26443 a RCE affecting Microsoft Virtual Machine Bus that may allow a guest-to-host escape.

Share this article on social media:

Subscribe to Our Newsletter!

Stay on top of cybersecurity risks, evolving threats and industry news.

The Latest Cybersecurity News

From major cyberattacks, newly discovered critical vulnerabilities to recommended best practices, read it here first:

Tell us about your needs.
Get an answer the same business day.

Tell us about your needs.
Get an answer the same business day.

Fill out the form below and get an answer from our experts within 1 business day.
Got an urgent request? Call us at 1-877-805-7475 or Book a meeting.
PCI-DSS

What happens next:

  • We reach out to learn about your objectives
  • We work together to define your project's scope
  • You get an all-inclusive, no engagement proposal

Scroll to Top

BOOK A MEETING

Enter Your
Corporate Email

BOOK A MEETING WITH AN EXPERT

Enter Your Corporate Email

Restez Informés!

Abonnez-vous pour rester au fait des dernières tendances, menaces, nouvelles et statistiques dans l’industrie.