Penetration testing -

At Nextdoorsec, we take external penetration testing to the next level. We use simulated hacking attacks to test the effectiveness of your IT security defenses against real-world threats. Our experienced engineers perform open-source intelligence gathering to find sensitive information that can be used to exploit potential vulnerabilities in your external network. We also conduct thorough scanning and enumeration to identify possible weaknesses in your systems and assess the extent of the damage a real attacker could cause. With our Penetration testing as a service (PTaaS), you can rest assured that your organization is prepared to defend against external threats.

Our Methodology

Our Penetration Testing Company follow industry-standard methodologies such as NIST SP 800-115 Technical Guide to Information Security Testing and Assessment and OWASP Testing Guide (v4) to provide offensive cybersecurity services to our clients. In addition to these, we also use customized testing frameworks to ensure that our security testing services covers all aspects of your IT infrastructure and helps you identify and remediate vulnerabilities before attackers can exploit them.


At Nextdoorsec, we start each project by gathering customer goals and obtaining rules of engagement. This ensures that we fully understand our client’s needs and requirements, allowing us to tailor our offensive cybersecurity services to best meet their needs.


We kick off our offensive cybersecurity services by performing a thorough scanning and enumeration process. This helps us identify any potential vulnerabilities, weak spots, and possible exploits that can compromise your organization’s security.


Nextdoorsec will exploit possible vulnerabilities to confirm them. This helps us assess each vulnerability’s effect on your IT infrastructure. Once successful access has been obtained, additional discovery will be conducted to explore the extent of the potential risks.


Nextdoorsec carefully documents all identified vulnerabilities, successful and unsuccessful exploitation attempts, and overall company strengths and weaknesses to provide comprehensive and actionable reports to our clients.

Which IT assets does our External Penetration Test cover?

At Nextdoorsec, we provide External Penetration Tests that are customized to your organization and aimed to assess the security of your external IT assets.

External Application Servers

Our External Pen Testing Services involves attempting to penetrate Internet-facing application servers belonging to your organization, such as Oracle and Apache Tomcat. We focus on identifying vulnerabilities and potential exploits that could compromise the security of your IT infrastructure.

External Web Servers and Websites

Our Web Application Penetration services aims to penetrate your organization’s Internet-facing web servers and websites, such as Apache HTTP Server, Nginx, IIS, and other related assets.

External VPN Servers

We perform external penetration testing that includes attempting to penetrate your organization’s internet-facing VPN servers. Our Network Security Services target VPN solutions such as Cisco VPN, Juniper SSL VPN, Palo Alto SSL VPN, OpenVPN, and more to assess their security posture against potential threats.

✅ External Database Servers

Nextdoorsec attempts penetration testing to your organization’s internet-facing database servers in our external penetration test. Our team will test for vulnerabilities in database management systems such as MySQL, PostgreSQL, Oracle, and Microsoft SQL Server, among others.

External Mail Servers

We strive to cover all your external IT assets during our External Penetration Test. This includes attempting to infiltrate Internet-facing mail servers belonging to your organization, such as Exim, Postfix, Outlook, and more.


External File Servers

We conduct External Network Penetration Testing to attempt to infiltrate Internet-facing file servers belonging to your organization. This includes file transfer protocol (FTP) servers, secure file transfer protocol (SFTP) servers, network file system (NFS) servers, and server message block/Common Internet File System (SMB/CIFS) servers. Our goal is to identify potential vulnerabilities and weak areas that malicious actors can exploit.

Can you risk losing customers as a result of a security breach?

Contact Nextdoorsec to begin your offensive cybersecurity journey with our expert penetration testing services.

What vulnerabilities and tests does our External Penetration Test cover?

At Nextdoorsec, our External Penetration Tests comprehensively cover the most critical external network and software vulnerabilities recognized by the industry.

💣 Buffer Overflows & Heap Overflows and other software vulnerabilities in external services


💣Social media intelligence gathering 

💣 Vulnerability scanning and exploitation

💣 Username and account enumeration

💣 Enumerating third parties for data leaks (S3 Buckets, GitHub, etc.)

💣 Broken Authentication, Authorization, Privilege Escalation & Race Conditions vulnerabilities in external services

💣 DNS Spoofing & DNS Poisoning

💣 Credential Reuse, Weak Passwords & Default Passwords

💣 Breached credential intelligence gathering

💣 Service, port, and website enumeration

💣 Code injections & Request Forgery vulnerabilities (e.g. SQL Injection, OS Command Injection, XSS, Directory Traversal, etc.) in external services

💣WAF and IDS evasion attacks

💣 Attacking login portals (Website, O365, VPN, etc.)

💣 Multi-Factor Authentication (MFA) bypassing

💣 Other testing depending on specific customer content and footprint

Word on the street

We're not like average security penetration testing companies. We've earned a reputation for delivering tailored solutions to businesses of all sizes. From mom-and-pop shops to tech startups, our expertise keeps your data safe and sound. Our clients appreciate our customized approach and commitment to transparency. Join the Nextdoorsec fam, one of the reliable vulnerability assessment companies and rest easy knowing your security is in good hands.

Nextdoorsec is an exceptional security company that provides thorough and detailed reports that are easy to understand. Their team is highly knowledgeable and responsive, always willing to answer any questions and provide guidance on how to properly address security vulnerabilities according to industry best practices. With Nextdoorsec's help, we were able to identify and address previously undetected security gaps in our systems, giving us greater confidence in our overall security posture. We highly recommend Nextdoorsec for any organization looking to improve their security posture and protect their valuable assets.

Pieter van der Meer
Cloud Architect

Nextdoorsec provided our organization with top-notch security services. Their team was incredibly thorough and professional, and their level of communication was outstanding. They kept us informed at every step of the process and were always available to answer any questions we had. We were particularly impressed with their commitment to transparency and their ability to provide actionable recommendations for improving our security posture. We would highly recommend Nextdoorsec to any organization looking to enhance their security and protect their valuable assets.

Lars Jansen

Contact Us


Antwerp, Belgium

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