PostgreSQL Exposure Across the EU: A Snapshot from Shodan Data

Methodology

Scope: 27 European Union member states

AT, BE, BG, HR, CY, CZ, DK, EE, FI, FR, DE, GR, HU, IE, IT, LV, LT, LU, MT, NL, PL, PT, RO, SK, SI, ES, SE

Query focus:

• Services responding as PostgreSQL on port 5432.

The results below are based entirely on Shodan indexed data at the time of collection. Not every service running on port 5432 is guaranteed to be PostgreSQL. However, fingerprinting indicates that the overwhelming majority are genuine PostgreSQL deployments.

Total PostgreSQL Exposure in the EU

Total exposed PostgreSQL services: 185,649

That is nearly two hundred thousand database servers directly reachable from the public internet within the EU alone. For a database engine that is typically intended to sit behind an application layer, that is a meaningful surface area.

Germany represents roughly 40 percent of all EU PostgreSQL exposure. Poland ranks second, which is notable compared to its MySQL footprint.

Product Breakdown

The dataset is overwhelmingly composed of standard PostgreSQL instances. A small number fingerprint as AWS Redshift clusters. Even managed cloud databases require strict access controls. Public reachability without tight IP restrictions still increases risk.

Is Public PostgreSQL Exposure a Security Problem?

In most modern architectures, yes. PostgreSQL is typically intended to be:

• Inside a private subnet
• Behind an application server
• Restricted to internal services
• Accessible only via VPN or controlled IP ranges

Direct exposure on port 5432 creates an authentication surface that can be:

• Probed for version information
• Targeted with credential stuffing
• Subjected to brute force attempts
• Assessed for known CVEs
• Tested for misconfigured authentication rules

Exposure does not automatically mean compromise. But it does dramatically increase the number of entities that can interact with your database.

From a Pentester Perspective

When we discover an internet exposed PostgreSQL instance during an assessment, it immediately becomes a priority target. We evaluate:

• Can we connect directly from the internet?
• Is TLS enforced?
• What authentication method is configured?
• Are weak passwords accepted?
• Is there rate limiting?
• Is the version supported and patched?

If we can reach the login interface and attempt authentication without IP restriction or throttling, this is typically classified as a High finding. If weak credentials are discovered, trust authentication is misconfigured, or superuser access is exposed remotely, it becomes Critical.

Databases frequently contain the most sensitive data in an organization. Compromise impact is rarely low.

Final Thoughts

185,649 publicly reachable PostgreSQL services across the EU represents a meaningful attack surface. PostgreSQL is mature and capable of strong security, but direct exposure combined with weak authentication creates a high-value target. Visibility tells us what is reachable; segmentation, authentication, and monitoring determine whether it is defensible.