MongoDB 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 on port 27017, typically associated with MongoDB.

Important context:

• Not every service on port 27017 is MongoDB
• Some may be proxies, honeypots, or unrelated software
• Fingerprinting is based on Shodan visibility

The numbers represent observable exposure, not confirmed configuration state.

Total MongoDB Exposure in the EU

Total services responding on port 27017: 60,534

For a database that often stores application data, session data, user information, and business logic collections, that is a significant attack surface.

Germany and the Netherlands account for more than half of the visible exposure. That aligns with infrastructure density and hosting concentration, but exposure is what defines risk, not geography.

What Is Actually Running on Port 27017?

Fingerprinting results show a diverse set of products.

The majority appear to be genuine MongoDB instances. The presence of other products highlights that port exposure gives visibility, but not always a definitive identification of the primary service.

Why MongoDB Exposure Matters

Historically, exposed MongoDB instances have been heavily abused. Common past incidents include:

• Entire databases dumped
• Collections wiped and replaced with ransom notes
• Sensitive data exposed publicly
• Cryptomining installations

Earlier versions of MongoDB were often deployed without authentication enabled by default. When network isolation failed, databases became fully accessible from the internet.

From a Pentester Perspective

When we encounter an internet facing MongoDB instance, we test:

• Is authentication enabled?
• Can we list databases?
• Can we read collections?
• Is TLS enforced?
• Is the version supported?
• Are administrative roles exposed remotely?

If we can connect and list databases without authentication, that is a Critical issue. Database compromise often leads to full application compromise.

Final Thoughts

60,534 services responding on port 27017 across the EU represents a substantial attack surface. MongoDB is powerful and flexible, but its risk increases significantly when it is directly reachable from the internet.