Google formed Update Chrome 91.0.4472.101, in which Fixed 14 vulnerabilities, including the CVE-2021-30551 problem, already used by intruders in the exploits (0-Day). Details while are not disclosed , it is only known that the vulnerability is caused by incorrect type processing (Type Confusion) in the JavaScript engine V8.
The new version also eliminated another dangerous Vulnerability of CVE-2021-30544, caused by referring to memory after its release (use-after-free) in the transition cache (BFCACHE, back-forward cache ) used for instantaneous transition when using the” Back “and” Fad “buttons or navigating the previously viewed pages of the current site. The problem is assigned a critical level of danger, i.e. It is indicated that the vulnerability allows you to bypass all the levels of the browser protection and it is enough to perform the code in the system outside the Sandbox-environment.