CVE-2021-21215: 
Google Chrome vulnerability analysis and mitigation

CVE-2021-21215 is a security vulnerability discovered in Google Chrome's Autofill feature prior to version 90.0.4430.72. The vulnerability was identified as an inappropriate implementation in the Autofill functionality that allowed a remote attacker to spoof security UI through a crafted HTML page (NVD, Chrome Release).

The vulnerability is classified with a CVSS v3.1 Base Score of 6.5 (Medium severity), with the following metrics: Attack Vector: Network, Attack Complexity: Low, Privileges Required: None, User Interaction: Required, Scope: Unchanged, Confidentiality: None, Integrity: High, Availability: None. The vulnerability is categorized under CWE-290 (Authentication Bypass by Spoofing) (NVD).

The vulnerability could allow an attacker to spoof the security user interface of Chrome through a specially crafted HTML page, potentially leading to user deception and compromised security decisions (NVD).

The vulnerability requires user interaction and can be exploited remotely through network access. The attack complexity is considered low, requiring no special privileges for exploitation (NVD).

The vulnerability was patched in Google Chrome version 90.0.4430.72. Users and administrators are advised to upgrade to this version or later to mitigate the risk. The fix has been incorporated into various distributions including Debian, Fedora, and Ubuntu (Chrome Release, Debian Advisory).