CVE-2021-30613: 
vulnerability analysis and mitigation

CVE-2021-30613 is a Use-after-free vulnerability discovered in the Base internals of Chromium-based browsers. The vulnerability was identified in Google Chrome versions prior to 93.0.4577.63 and affected various Chromium-based browsers including Microsoft Edge. The issue was disclosed and patched in September 2021 (NVD, CVE).

The vulnerability is classified as a Use-after-free (CWE-416) issue in the Base internals component. It received a CVSS v3.1 base score of 8.8 (High) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating network accessibility, low attack complexity, no privileges required, and user interaction required for exploitation (NVD).

If successfully exploited, this vulnerability could allow a remote attacker to potentially exploit heap corruption via a crafted HTML page, potentially leading to arbitrary code execution with the same privileges as the browser process. The high CVSS score indicates potential severe impacts on confidentiality, integrity, and availability of the affected system (NVD).

The vulnerability was addressed in Chrome version 93.0.4577.63 and Microsoft Edge version 93.0.961.38. Users are advised to update their browsers to these versions or later to mitigate the risk. The fix was also distributed to other Chromium-based browsers and various Linux distributions including Fedora, Debian, and Ubuntu (Fedora Update).