CVE-2021-35546: 
MySQL vulnerability analysis and mitigation

A vulnerability was discovered in the MySQL Server product of Oracle MySQL (component: Server: Replication) affecting versions 8.0.26 and prior. The vulnerability was disclosed on October 20, 2021, and assigned identifier CVE-2021-35546 (NVD, Oracle Advisory).

The vulnerability has been assigned a CVSS v3.1 Base Score of 4.9 (Medium severity) with the following vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. The vulnerability requires high privileges and network access via multiple protocols to exploit. The attack complexity is considered low, requires no user interaction, and the scope is unchanged (NVD).

Successful exploitation of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. The vulnerability only affects availability, with no impact on confidentiality or integrity (NVD, Oracle Advisory).

The vulnerability is considered easily exploitable by an attacker with high privileges and network access via multiple protocols. The attack requires no user interaction and can be executed with low complexity (NVD).

Oracle released patches to address this vulnerability in MySQL version 8.0.27. Multiple Linux distributions have also released security updates including Fedora 33, 34, and 35 with community-mysql-8.0.27-1 packages (Fedora Update, Ubuntu Notice).