The Oracle Critical Patch Update for October, 2017, contains an unusually high number of patches for vulnerabilities that may be remotely exploitable without authentication, i.e., may be exploited over a network without requiring user credentials.
The impact of each vulnerability is specific to individual Oracle products affected, but are all rated "High" in terms of the risk of a Confidentiality (data exposure), Integrity (data modification), or Availability (data loss) security incident.
See the link below to the "Oracle Critical Patch Update" for a list of Oracle products and versions affected. 
- Review the "Oracle Critical Patch Update" to identify affected products currently in operation. 
- Patch accordingly.