Provide references for CVE-2021-2173.
Where can I find more information about CVE-2021-2173?
References are available at: https://www.oracle.com/security-alerts/cpuapr2021.html, https://github.com/emad-almousa/CVE-2021-2173, http://packetstormsecurity.com/files/171344/Oracle-DB-Broken-PDB-Isolation-Metadata-Exposure.html.