The proactive detection of security vulnerabilities

What is a vulnerability assessment service?

Currently, Information/Cyber Security faces various threats, such as malware or denial of service attacks, and new and more sophisticated attacks that are being launched every day. The speed at which new threats are created makes risks even greater. Also, complex network and software applications have inherent security weaknesses in the form of vulnerabilities and misconfigurations. Identifying and measuring vulnerabilities requires constant monitoring, which is a significant challenge for businesses of all sizes.

A Vulnerability Assessment service is a critical component as it enables the proactive detection of security vulnerabilities so that companies can fix them before they are exploited. Security best practices say frequent vulnerability scans are a practice every company must follow. The difference between a Vulnerability Assessment/Scan and a Penetration Test is that during a Vulnerability Assessment, we will attempt to determine what vulnerabilities exist and to what extent exploitation of these vulnerabilities may be possible, but without performing the exploitation of the vulnerabilities (non-intrusive).

Benefits of vulnerability assessment services

  1. Identify Vulnerabilities: The primary objective is to discover and list all potential vulnerabilities and weaknesses that are present in the environment. The discovery is based only on the information gathered by our team in a non-intrusive way.

  1. Risk Assessment: By identifying and listing potential vulnerabilities, you to quickly evaluate a great number of assets so that you can estimate the risks associated with your environment.

  1. Test Current Safeguards: Your organization can estimate the effectiveness of the current security controls/solutions in place.

  1. Stay Compliant: Many industries and regulatory frameworks require periodic vulnerability scans to ensure compliance with security standards. These security scans help organizations meet the requirements while maintaining risks to an acceptable level.

Castellan's 3 major approaches:

  1. Black-box testing

In black-box testing, our security experts are given no information on the system/network/application, relying only on publicly available information and whatever they can deduce. This helps you create an inventory of unidentified assets. Black-box testing is also known as zero-knowledge or blind tests. Choose this approach if you want the fastest vulnerability scan to be performed.

  1. Gray-box testing

In gray-box testing, the consultants are given some information such as a user of the system/network/application, and some basic information on the architecture. This makes the scan more efficient. Grey-box testing is also known as partial knowledge testing. You can select this approach if you want to cover a larger size of assets.

  1. White-box testing

White-box, also known as full-knowledge, open-box or clear-box testing, is where our experts are given full access to detailed architectural documentation, source code, and/or full credentials. White-box testing is much more focused on giving more precise information. This option is your best bet if you want the highest level of accuracy and coverage, with no time constraints.

There are 2 perspectives for conducting a vulnerability assessment service, depending on where the consultant is performing the test:

  1. External

An external Vulnerability Assessment is a service which scans publicly facing assets from an external source such as the Internet.

  1. Internal

An internal Vulnerability Assessment service is performed from the internal network against the internal assets of the company.


  1. Network/Infrastructure (On-Prem)

During an external network vulnerability assessment (On-Prem), we execute a set of automated scans on the public network infrastructure (DMZ, firewalls, routers, switches, servers, and other components) to identify potential security flaws/vulnerabilities.

  1. Network/Infrastructure (Cloud)

A Cloud vulnerability scan service is a specialized form of network vulnerability scan that focuses on identifying flaws and misconfigurations of cloud-based infrastructure, platforms, and services.

  1. Web Application

This Vulnerability Assessment service analyzes the security of a publicly available web-based application or website. The primary goal is to identify deficiencies specific to the web environment.


  1. Network/Infrastructure (On-Prem)

During an internal Vulnerability Scan (On-Prem), the vulnerability scans are performed on the internal network (internal firewalls, switches, gateways, bridges, servers, and other components of the internal network to identify potential flaws/vulnerabilities.

  1. Network/Infrastructure (Cloud)

An internal Vulnerability Assessment service focuses on vulnerabilities of private cloud-based infrastructure, platforms, and services.

  1. Web Application

This service assesses the security of a web-based application or website available in the internal network of an organization. The primary goal of an internal web application vulnerability scan remains the same: identify and list all potential security flaws specific to the web environment.

  1. Wireless/WiFi

Wireless vulnerability scan service attempts to identify (but not exploit) all potential flaws/misconfigurations of a company's Wi-Fi network that are available in the physical range of the wireless signal. This includes Wi-Fi networks, wireless/Bluetooth devices, cellular networks or other RF technologies.

What value can Castellan bring to your organization?

  1. Expertise: Our team consists of highly skilled and certified security professionals with extensive experience in Information/cyber security, technology, and consulting. Their deep knowledge and diverse skills ensure a thorough understanding of the security landscape and enable us to provide the best recommendations and solutions.

  2. Specialized Tools: Our consultants use a combination of proprietary and industry-leading vulnerability assessment tools. These solutions, coupled with an in-depth analysis of vulnerabilities, enable us to evaluate your security posture accurately.

  3. Easy to Digest Reports: We do not deliver reports autogenerated by our vulnerability scan tools. Instead, we craft concise and customized reports that include a description of all the security flaws found and recommendations to fix them. The report contains two sections: an executive summary that summarizes the project, and a technical section containing detailed findings and recommendations.

  4. Personalized Approach: Castellan focuses only on Information/Cyber Security, which allows us to offer highly personalized consulting services, enabling us to build strong partnerships and work closely with you to address your specific needs and challenges. Our approach involves collaborating closely with your key staff to design a customized security service that aligns with your requirements. This ensures that our service(s) is(are) tailored to your specific needs.

  5. Staff Cost-savings: By opting for our professional services, you gain access to our team at a fraction of the cost of hiring an in-house security expert. This offers significant cost savings while still benefiting from the extensive knowledge and skills of our team of experts.

The usage of computing technology enables businesses to enhance commerce and widen their reach to customers, partners, and suppliers. Nevertheless, the intricate network architectures and software applications utilized also come with inherent security vulnerabilities. By combining internal and external

Vulnerability assessment services, Castellan delivers comprehensive visibility into each area of potential exposure. Each service component is integral to a vulnerability management framework, helping reduce risk and quantify overall security posture.

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