An internal penetration test analyzes the security of IT systems and network segments that are not directly accessible from the internet – the “inner area” of an IT infrastructure. Typically tested are complete corporate networks or individual, particularly sensitive network zones.
Such tests simulate the approach of an attacker who is already inside the network – for example, through compromised devices, infected USB sticks, or after a successful phishing attack with obtained credentials. Testing can also assess how far weaknesses can be exploited from the perspective of internal employees with limited permissions.
The focus is on the following questions:
- Can users access data or systems for which they do not have sufficient authorization?
- Can configuration errors or vulnerabilities be exploited to gain elevated privileges in the network (privilege escalation)?
- Can malware or ransomware spread undetected through the network?
- Are shadow IT systems or uncontrolled services present?
- Which internal systems are vulnerable due to outdated software or weak configurations?
In practice, internal networks frequently contain security vulnerabilities – whether due to misconfigured permissions, unclear network segmentation, legacy systems, or missing updates. An internal penetration test helps make these weaknesses visible before they can be exploited.
The final report includes a clear prioritization of identified vulnerabilities, technical details for traceability, and recommendations for remediation.
Internal tests are particularly relevant for:
- Organizations with sensitive data and internal access (e.g., HR, finance, or production systems)
- Organizations with flat or historically grown network structures
- Institutions with heightened regulatory requirements or certification goals
Examples from practice: financial institutions, public administration, industrial and service companies, hospitals, and insurance companies.
Contact us for a consultation and further information.