In protecting corporate information assets against cyber threats, physical risks, and legal sanctions, the most important step is the early detection of threats. The most critical and central component of the ISO 27001 Information Security Management System (ISMS) standard is the "Risk Assessment" process. A risk assessment that is incorrect, incomplete, or done solely for the purpose of documentation can render all your cybersecurity investments ineffective. Therefore, it is of great importance to conduct the risk assessment process with a correct methodology.
In this guide, we will discuss in detail how to perform a risk assessment fully compliant with ISO 27001 standards, the steps of creating an asset inventory, and risk treatment strategies.
What is ISO 27001 Risk Assessment?
ISO 27001 risk assessment is the process of systematically analyzing the threats to the organization's information assets, the vulnerabilities inherent in these assets, and the business impact that would arise if these threats materialize.
The primary purpose of the process is to enable you to direct your information security budget and human resources to the most accurate areas. Thanks to risk assessment, the answer to the question "Which asset should we protect, against which threat, and with what budget?" is given based on data.
Step-by-Step Risk Assessment Process
To perform a risk analysis in accordance with the ISO 27001 standard, the following steps must be followed in sequence.
1. Determining the Risk Assessment Methodology
Before starting the process, a written methodology defining how risks will be measured must be defined.
- Qualitative Analysis: Grading risks with verbal expressions such as "Low, Medium, High". It is generally preferred because it is faster and more practical.
- Quantitative Analysis: Measuring risks with numerical data based on financial loss or time (e.g., "The downtime of this server leads to a loss of $10,000 per hour").
2. Compiling the Information Asset Inventory
In order to perform a risk assessment, we first need to know what we are protecting. All information assets in the company are listed to create an inventory. Information assets cover the following categories:
- Hardware Assets: Servers, user computers, firewalls, switches, mobile devices.
- Software Assets: Operating systems, databases, ERP/CRM software, custom applications.
- Data Assets: Customer data, financial records, source codes, contracts.
- Human Resources: Employees, outsourced personnel, suppliers.
- Services and Processes: Email service, internet access, backup processes.
3. Identifying Threats and Vulnerabilities
For each information asset, potential threats and vulnerabilities that would make it easier for these threats to harm the asset are paired.
- Threat Examples: Cyber attacks, ransomware, unauthorized access attempts, data leaks, power outages, fire, flood, or user errors.
- Vulnerability Examples: Outdated operating systems, weak password policies, lack of fire suppression systems in the system room, low cybersecurity awareness among employees.
4. Calculating the Risk Score (Probability and Impact Analysis)
A risk score is calculated for each paired threat and vulnerability. The formula is simply as follows: $$\text{Risk Score} = \text{Probability (Likelihood)} \times \text{Impact}$$
- Probability: The frequency of occurrence of the threat (e.g., scored from 1 to 5; 1 = Very Rare, 5 = Very Frequent).
- Impact: The damage the company will suffer when the threat materializes (1 = Very Low, 5 = Very Critical).
- Example: The probability of a cyber attack on an unpatched server is high (4), and if this server hosts the customer database, the impact is also critical (5). In this case, the risk score is calculated as $4 \times 5 = 20$ (Critical Risk).
Prominent Threats in the Risk Profile of Companies in Ankara
Ankara, being the center of public institutions, defense industry, and critical infrastructure providers, is the region where cyber espionage, targeted attacks (APT), and data leak risks are experienced most intensely. For companies working integrated with the public sector, violation of data confidentiality can lead to irreversible results not only financially but also legally and reputationally.
Therefore, businesses in Ankara need to consider local threat elements and public regulations (e.g., Presidency Information and Communication Security Guide) when performing risk assessments.
Risk Treatment Strategies
Calculated risk scores are compared with the pre-determined "Acceptable Risk Level" (e.g., score threshold is 9). A "Risk Treatment" strategy must be selected for all risks remaining above this threshold:
| Strategy | Description | Example Application |
|---|---|---|
| Mitigation | Implementing technical or administrative controls to reduce risk. | Installing a firewall, providing cybersecurity training to staff. |
| Avoidance | Completely stopping the activity or technology that creates the risk. | Discontinuing the use of an unsecure legacy software. |
| Transfer | Transferring the financial or operational burden of the risk to a third party. | Getting cybersecurity insurance, moving data storage to a secure cloud provider. |
| Acceptance | Accepting the risk in its current state (usually if the cost of control is higher than the risk itself). | Accepting the downtime risk if the cost of a redundant internet line is much higher than the potential 1-hour outage damage. |
Recommendation: To analyze your company's risk profile correctly, manage legal compliance processes, and develop risk methodologies in accordance with international standards, you can benefit from our Business and Management Consulting services.
Role of Technical Controls in Risk Mitigation
When you choose the risk mitigation strategy, you need to put ISO 27001 Annex A controls into practice. Receiving professional Information Security Policy Consulting services during the design of these controls and the creation of legal and administrative policies directly affects the success of your risk treatment plan.
Additionally, to learn about the certification steps to be taken after the risk assessment process, you can review our ISO 27001 Certification Steps guide. You can also browse our article What is ISO 27001? where we discuss the corporate benefits of the standard in a broader framework.
To conduct a realistic risk assessment study that will successfully pass audits, please contact us.
Frequently Asked Questions
How often should risk assessment be performed?
In accordance with the ISO 27001 standard, risk assessment must be repeated regularly at least once a year. In addition, the risk analysis must be updated immediately when a major IT infrastructure change is made in the company, a new office is opened, a new critical software is introduced, or a major cybersecurity incident is experienced.
Is it possible to reduce all risks to zero?
No, there is no such concept as "zero risk" in cybersecurity and information security. There will always be a "Residual Risk". The important thing is to reduce risks below the "Acceptable Risk Level" approved by the corporate management.
Should the risk assessment study be performed only by the IT department?
No. Information security risks do not consist solely of technical risks. Human resources processes, physical security, procurement processes, and legal contracts also directly affect information security. Therefore, it is mandatory for all department representatives and senior management to be included in the risk assessment committee.
Conclusion
ISO 27001 risk assessment forms the cornerstone of your corporate security. Thanks to a correctly configured risk analysis, you can build a proactive line of defense against cyber threats while managing your security investments with the highest efficiency. Knowing your risks is the first and most important step in managing them.
