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.
This field is for validation purposes and should be left unchanged.

The Latest Cybersecurity News

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

Tell us About your Needs
Get an Answer the Same Business Day

Got an urgent request? Call us at 1-877-805-7475 or Book a meeting.

What happens next:

A Vumetric expert will contact you to learn more about your cybersecurity needs and goals.

The project's scope will be defined (Target environment, deadlines, requirements, etc.)

A detailed quote including all-inclusive pricing and statement of work is sent to you.

PCI-DSS
This field is for validation purposes and should be left unchanged.
2024 EDITION

PENETRATION TESTING Buyer's Guide

Everything You Need to Know

Gain confidence in your future cybersecurity assessments by learning to effectively plan, scope and execute projects.

BOOK A MEETING

Enter your Email Address

This field is for validation purposes and should be left unchanged.

* No free email provider (e.g: gmail.com, hotmail.com, etc.)

This site is registered on wpml.org as a development site. Switch to a production site key to remove this banner.