Security News > 2021 > June > Microsoft Raises Alarm for New Windows Zero-Day Attacks

"These attacks exploited a chain of Google Chrome and Microsoft Windows zero-day exploits. While we were not able to retrieve the exploit used for remote code execution in the Chrome web browser, we were able to find and analyze an elevation of privilege exploit that was used to escape the sandbox and obtain system privileges," Larin explained.

According to Kaspersky, the two Windows flaws were chained to an exploit for a different Chrome vulnerability to plant high-end malware on specific targets running Windows.

In addition to the two flaws documented by Kaspersky, Microsoft is also calling urgent attention to CVE-2021-33739, CVE-2021-33742, CVE-2021-31199 and CVE-2021-31201, warning that all six of these bugs have been targeted by attackers before the availability of patches.

In all, Redmond's product security response teams shipped band-aids for at least 50 documented vulnerabilities affecting the Windows OS, the Microsoft Office productivity suite, Microsoft Edge, SharePoint Server, and the Windows Defender anti-malware feature.

Five of the 50 documented vulnerabilities are rated "Critical," Microsoft highest severity rating.

Windows administrators are strongly urged to review the available patches from Microsoft and prioritize the deployment of the CVEs under active exploitation.

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