The vulnerabilities include a buffer overflow and three free-use vulnerabilities. However, CVE-2020-15999 is the worst and relies on your browser to automatically install custom fonts.
CVE-2020-15999 is a heap buffer overflow in Freetype and was discovered by Google Project Zero on October 19, 2020.
Google Project Zero has not released any technical details on the attacks that exploited CVE-2020-15999 in the wild to avoid mass exploitation by threat actors. However, it is believed that this is related to the ability of websites to request the installation of the Web Open Font format, and so could likely be exploited simply by visiting a website.
Chrome browser versions earlier than 86.0.4240.111 are vulnerable. If you have an update pending (green arrow in your Chrome menu), now may be a good time to restart your browser. If you don’t, it might be a good idea to check your version at Chrome> Menu> Help> About.
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