If you must run 10.2.0.5, remove the server from the public internet entirely. Place it behind strict internal firewalls.
Running unsupported database software violates standard regulatory compliance frameworks like PCI-DSS and HIPAA.
Oracle Database 10g Release 2 (10.2.0.2 through 10.2.0.5) was a landmark release in the evolution of enterprise database technology. The "g" in 10g stands for , a precursor to modern cloud computing architectures that allowed multiple independent computers to act as a single, coordinated system.