02 / Test · Penetration testing

Penetration testing.
Know what to fix.

Understand how an attacker could reach your critical systems—and give your team evidence to act on.

Karhu scopes testing around your environment, investigates attack paths, and turns findings into practical priorities for your technical team and leadership.

Choose the right scope

Different entry points.
A connected view of risk.

An engagement can focus on one area or combine several. We match the testing to the questions your organization needs answered.

01

External network testing

What can an attacker reach from the internet?

Evaluate the systems and services exposed outside your organization, including agreed public addresses and remote-access entry points. Investigate weaknesses that could provide an initial foothold.

Internet-facing exposure · Remote access · Initial access

02

Internal network testing

What could happen after an attacker gets inside?

Assess the access available from an agreed starting point within your network. Examine how permissions, credentials, and segmentation affect the ability to reach sensitive systems.

Internal access · Privilege boundaries · Segmentation

03

Web application & API testing

Can someone access data or actions they should not?

Examine authentication, authorization, exposed data, and application workflows. Testing can compare agreed user roles and investigate weaknesses in how your application enforces access and handles requests.

User roles · Application logic · Data access

04

Wireless testing

Does wireless access respect your security boundaries?

Review agreed wireless networks and their access controls. Evaluate how authentication, configuration, and separation between guest and internal networks affect your exposure.

Wireless access · Authentication · Network separation

05

Phishing & social engineering

How do people and processes respond to a realistic approach?

Use an agreed scenario to evaluate recognition, reporting, and response. Define the audience, techniques, objectives, and handling of results with your team before the engagement.

Scoped scenarios · Employee reporting · Process improvements

06

Physical security testing

Could physical access undermine your technical defenses?

Evaluate agreed locations and physical access controls through an authorized engagement. Establish permitted activities, site contacts, and clear boundaries before work begins.

Facility access · Physical controls · Agreed boundaries

What you receive

From technical findings
to practical action.

The report should help your team understand the evidence, the impact, and the work ahead. Deliverables and review sessions are defined in your engagement.

Leadership perspective

A clear summary of significant findings, potential business impact, and the priorities leadership needs to understand.

Technical findings

Documented weaknesses and supporting evidence, with affected systems, risk context, and practical remediation guidance.

A shared next step

A findings review with your team to discuss the results, answer questions, and agree on remediation priorities.

What a useful finding explains

The path. The impact.
The fix.

Where is the weakness?
The affected asset or workflow and the conditions required.
Why does it matter?
What the evidence shows and how access could affect your operations.
What should happen next?
Remediation guidance and priorities your team can turn into owned actions.

How the engagement works

Clear boundaries.
Useful communication.

  1. Scope and authorize

    Agree on objectives, systems, access, testing windows, permitted activities, and communication contacts.

  2. Investigate and validate

    Evaluate the agreed environment and investigate how weaknesses can be exploited or connected into attack paths.

  3. Review the findings

    Discuss the evidence, operational implications, and remediation priorities with your technical team and leadership.

  4. Plan the follow-through

    Identify remediation owners and discuss engineering support or retesting where included in the agreed scope.

Start with your environment.

Bring the systems you want tested, your main concerns, any deadlines, and the constraints we should plan around. We’ll help turn those details into a workable scope.

Discuss your testing scope

From a penetration-testing client

“For any organization serious about security, Karhu Cyber is a trusted partner that will challenge assumptions, expose weaknesses, and provide the clarity needed to strengthen defenses.”
CEO
Read our client testimonials

The people behind the work

Expertise in practice.

Selected credentials held across our team in network, application, and wireless testing.

  • OSCPOffSec Certified Professional
  • OSWAOffSec Web Assessor
  • OSWPOffSec Wireless Professional
  • CEHCertified Ethical Hacker
  • PenTest+CompTIA
  • eJPT
Explore our team’s expertise

Before you get started

Common questions.

How is a penetration test different from a vulnerability scan?

A scan helps identify potential weaknesses across systems. A penetration test investigates whether and how weaknesses can be exploited within an agreed scope, including how several issues may combine into an attack path. The two approaches support different parts of a security program.

Which type of test do we need?

Start with the decision you need to make. External testing examines internet-facing exposure; internal testing examines what could happen from an internal foothold. Application, wireless, social engineering, and physical testing address different entry points. We help define a scope around your priorities and environment.

Will testing disrupt our operations?

Testing is planned around your operating constraints. Before work begins, we agree on testing windows, permitted techniques, exclusions, emergency contacts, and escalation procedures. Tell us about critical services, sensitive systems, and third-party restrictions during scoping.

What does our team need to provide?

Identify a technical contact, the systems or locations in scope, relevant business priorities, and any restrictions. Depending on the engagement, we may also need test accounts, access arrangements, network information, or documentation. Written authorization and the rules of engagement are established before testing.

How long does a test take, and what does it cost?

Timing and cost depend on the size and complexity of the environment, the testing objectives, access requirements, and reporting needs. We establish the scope, schedule, and commercial terms with you before the engagement.

Can you help with remediation and retesting?

We can discuss engineering support for addressing findings and follow-up testing to validate changes. Remediation assistance and retesting are agreed as part of the engagement scope or a separate next step.

Does a successful test mean we are secure?

A penetration test provides evidence about the systems, techniques, and period covered by the engagement. It cannot establish that every weakness has been found or prevent future vulnerabilities. Use the results alongside ongoing vulnerability management, monitoring, and security improvements.

Define your next engagement

What do you need
your test to answer?

Talk with Karhu