Google fixes seventh Chrome zero-day exploited in the wild this year


Level 12
Thread author
Top poster
Aug 2, 2020
Google has released Chrome 91.0.4472.114 for Windows, Mac, and Linux to fix four security vulnerabilities, with one of them a high severity zero-day vulnerability exploited in the wild.

This version, released today, June 17th, 2021, to the Stable desktop channel, has started rolling out worldwide and will become available to all users over the next few days.

Google Chrome will automatically attempt to upgrade the browser the next time you launch the program, but you can perform a manual update by going to Settings > Help > 'About Google Chrome'.

"Google is aware that an exploit for CVE-2021-30554 exists in the wild," the company's announcement reads.

The zero-day is caused by a use after free weakness in the WebGL (Web Graphics Library) JavaScript API used by the Chrome web browsers to render interactive 2D and 3D graphics without using plug-ins.

Successful exploitation of this vulnerability could lead to arbitrary code execution on computers running unpatched Chrome versions.

Although Google says that it is aware of CVE-2021-30554 in the wild exploitation, it did not share info regarding these attacks.

"Access to bug details and links may be kept restricted until a majority of users are updated with a fix," the company said.

"We will also retain restrictions if the bug exists in a third party library that other projects similarly depend on, but haven’t yet fixed."

Google fixed three more high severity use after free bugs today in Chrome's Sharing, WebAudio, and TabGroups components, tracked as CVE-2021-30555, CVE-2021-30556, and CVE-2021-30557.

Seventh Chrome zero-day exploited in the wild this year​

Today's update fixes Google Chrome's seventh zero-day vulnerability exploited in attacks this year, with the other six listed below:

In addition to these zero-days, Kaspersky reported that a threat actor group known as Puzzlemaker is chaining Chrome zero-day bugs to escape the browser's sandbox and install malware on Windows systems.