Security Experts:

Google Confirms Sixth Zero-Day Chrome Attack in 2021

Google’s ongoing struggles with in-the-wild zero-day attacks against its flagship Chrome browser isn’t going away anytime soon.

For the sixth time this year, the search giant shipped a Chrome point-update to fix code execution holes that the company says is already being exploited by malicious hackers.

“Google is aware that an exploit for CVE-2021-30554 exists in the wild,” the company said in an advisory posted on Thursday.  It refers to a use-after-free vulnerability in WebGL, the JavaScript API used to render graphics without browser plugins.

[ Related: Chrome Hit in Another Mysterious Zero-Day Attack ]

Google rated the flaw as “high-risk” and has started pushing the latest patch to users via the browser’s automatic-updating mechanism.  

Google did not provide any additional details on the attacks, except to say it was reported anonymously two days ago, on June 15, 2021.

The latest Chrome version 91.0.4472.114 is available for Microsoft Windows, Apple macOS and Linux users.

In addition to the zero-day being exploited, Google also patched three separate memory corruption vulnerabilities in WebAudio, TabGroups and Sharing.

It’s been a record year for zero-day attacks with Google patching six such bugs in the Chrome browser.  In all, zero-day trackers have documented a total of 47 in-the-wild attacks targeting software flaws unknown even to the vendor.

Related: Google Chrome Zero-Day Under Attack, Again

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Related: Google Chrome Hit in Another Mysterious Zero-Day Attack

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Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. Ryan is a veteran cybersecurity strategist who has built security engagement programs at major global brands, including Intel Corp., Bishop Fox and GReAT. He is a co-founder of Threatpost and the global SAS conference series. Ryan's past career as a security journalist included bylines at major technology publications including Ziff Davis eWEEK, CBS Interactive's ZDNet, PCMag and PC World. Ryan is a director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world. Follow Ryan on Twitter @ryanaraine.