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Exposing administrative network services directly to the public WAN is a leading vector for corporate ransomware deployment. This study examines open port distribution to highlight insecure listening services.
SSH port 22 is open on nearly a third of all public corporate boundaries.
MySQL and PostgreSQL servers are listening directly on public interfaces.
Obsolete, unencrypted communication standards remain active on historical hosts.
Automated botnets sweep the IPv4 namespace continuously. Exposing port 3389 (RDP) or database engines directly to standard scanners invites password-spraying and exploit matching.
Ensure all database engines are bound strictly to localhost or private network interfaces. Restrict SSH access using certificate-based authentication and security gateway boundaries.
ReconShield scanners monitored public network interfaces to detect active, listening services across standard TCP/UDP ports. Data was collected passively without executing exploits.
Global port scanning indexes and ReconShield border mapping logs.