Vulnerability in the Advanced Networking Option component of Oracle Database Server can lead to an MITM attack. Supported versions that are affected are 18c and 19c (Windows platform only).
Difficult to exploit vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Advanced Networking Option. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Advanced Networking Option, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in takeover of Advanced Networking Option.
CVSS 3.1 Base Score 8.3 (Confidentiality, Integrity and Availability impacts)
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H)
CVE Database: CVE-2021-2018
Vendor advisory: see here