Vulnerability in the Database Vault component of Oracle Database Server. Supported versions that are affected are 12.1.0.2, 12.2.0.1, 18c and 19c. Easily exploitable vulnerability allows high privileged attacker having Create Any View, Select Any View privilege with network access via Oracle Net to compromise Database Vault. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Database Vault accessible data. CVSS 3.1 Base Score 2.7 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N).
https://www.oracle.com/security-alerts/cpuapr2021.html
http://packetstormsecurity.com/files/170373/Oracle-Database-Vault-Metadata-Exposure.html