Multiple components in Oracle 9i Application Server (9iAS) are installed with over 160 default usernames and passwords, including (1) SYS, (2) SYSTEM, (3) AQJAVA, (4) OWA, (5) IMAGEUSER, (6) USER1, (7) USER2, (8) PLSQL, (9) DEMO, (10) FINANCE, and many others, which allows attackers to gain privileges.
https://exchange.xforce.ibmcloud.com/vulnerabilities/972
https://exchange.xforce.ibmcloud.com/vulnerabilities/971
https://exchange.xforce.ibmcloud.com/vulnerabilities/970
https://exchange.xforce.ibmcloud.com/vulnerabilities/969
https://exchange.xforce.ibmcloud.com/vulnerabilities/968