CVE-2021-30616: 
vulnerability analysis and mitigation

CVE-2021-30616 is a Use-after-free vulnerability discovered in the Media component of Chromium-based browsers. The vulnerability was disclosed and patched in Chrome version 93.0.4577.63. This security flaw affects multiple browsers built on the Chromium engine, including Google Chrome and Microsoft Edge (NVD, Ubuntu).

The vulnerability is classified as a Use-after-free (CWE-416) issue in the Media 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. This indicates that the vulnerability can be exploited remotely with low attack complexity, requires no privileges but does need user interaction, and can result in high impacts to confidentiality, integrity, and availability (NVD).

If successfully exploited, this vulnerability could allow an attacker to potentially exploit heap corruption through a crafted HTML page, leading to arbitrary code execution. The high CVSS score indicates that successful exploitation could result in significant impacts to system confidentiality, integrity, and availability (Ubuntu).

The vulnerability has been fixed in Chrome version 93.0.4577.63 and corresponding versions of other Chromium-based browsers. Microsoft Edge was patched in version 93.0.961.38. Users are advised to update their browsers to these versions or later to mitigate the vulnerability (Fedora).