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On June 17, 2021 Google released Chrome version 91.0.4472.114 for Windows, Mac, and Linux. The patch notes for this version can be viewed at Chrome Release Note.

Alert status
HIGH

This update addresses vulnerabilities that an attacker could exploit to take control of an unpatched system. Google is aware that exploits of CVE-2021-30551 and CVE-2021-30554 exist in the wild.

The ACSC is highlighting this reporting to ensure Australian individuals and organisations are informed about the current global threat environment, and are equipped to take proactive measures to improve your organisation’s cyber security posture. 

ACSC encourages users and administrators to review the Chrome Release Note and apply the necessary updates. ACSC encourages partners to report any sightings to asd.assist@defence.gov.au

Additional Advice for home users:

To mitigate this threat, Chrome users can go to Settings > Help > About Google Chrome. If your browser version on Linux, macOS and Windows is listed as 91.0.4472.114 or above you are safe. If not, manually check for updates and restart the browser.