Types of Cybersecurity Vulnerabilities: The Most Common and Critical from Datami’s Practice

Most cyber incidents start the same way: not with a complex attack, but with a small, long-known weakness that no one paid attention to. The problem is that companies rarely notice such points on their own. The system works, users log in, transactions go through - so everything seems fine. But a vulnerability can exist quietly for years until one day it becomes an entry point for an attacker.

Datami specialists know from their own experience that most risks are associated not with new hacking techniques, but with old problems that were not fixed in time. And here it is important to understand a key difference: a vulnerability is not yet an attack. It is an “open door” for an attack that an attacker can use at any moment.

What does “vulnerability” really mean for business?

A vulnerability is an error or weak point in a cybersecurity system: in code, configurations, or architecture. But for a company, it is always about consequences. A typical scenario looks like this:

First, it is just a weak spot → then hackers find it → next they exploit it for malicious purposes → and only then the business learns about the problem.

If at the first stage fixing it takes hours or days, later it already means weeks or even months spent dealing with consequences and recovery, budget losses, and crisis team efforts. That is why cybersecurity testing before launching or scaling a product is almost always cheaper than incident response.

Types of cyber vulnerabilities

Here are the five main groups of vulnerabilities.

1. Software flaws: When the problem is built into the product itself

The most dangerous vulnerabilities are those that appear at the development stage. But why, if they do not interfere with system operation, cause no errors, and can remain unnoticed for years? The reason is simple: modern digital products consist of dozens of libraries, integrations, and third-party components, and without systematic dependency control, risks accumulate along with functionality.

Such situations are clearly visible during professional audits. For example, during a cybersecurity assessment of a veterinary company providing services through a mobile platform, 26 vulnerabilities were discovered, including exposed API keys in code, outdated modules, and storage of sensitive data in source files. In practice, this meant that anyone could potentially gain access to internal services, and how attackers might exploit this can only be imagined.

Most often, such cybersecurity vulnerabilities have clearly recognizable symptoms:

• Dependencies have not been updated for months or years.
• Test keys, tokens, or service data remain in the code.
• Libraries are integrated without version verification.
• There is no separate security review before release.
• Such software vulnerabilities are regularly found not only in medical platforms but also in SaaS services, financial products, and enterprise systems.

2. Network vulnerabilities: When access can be gained “from the other side”

Many cybersecurity incidents start not with an attack on an application, but with infrastructure. If a network is configured incorrectly, a single weak node is enough to bypass perimeter protection.

This is well illustrated by the results of an infrastructure audit of an e-commerce platform, where real server IP addresses were accessible externally. This made it possible to access the system directly, bypassing protective mechanisms. From a business perspective, the situation may seem simple - protection exists. But there is one critical nuance - it can be bypassed.

In practice, network vulnerabilities most often manifest through the following signs:

• One network is used for both employees and guests.
• Internal services are accessible from the internet without necessity.
• Segmentation exists formally but does not restrict access.
• Device inventory is not maintained regularly.

Such cybersecurity issues are not tied to a specific industry - they are equally possible in online services and corporate environments.

3. Configuration errors: When settings create risk

Sometimes a system becomes vulnerable not because of code, but because of the parameters it operates with. Default accounts, excessive access rights, leftover test environments - all of these are classic configuration weaknesses.

For example, while checking access levels during a penetration test of a betting platform’s web applications, our experts discovered settings that could potentially allow data manipulation.

Such configuration vulnerabilities are regularly found in products across different industries, regardless of business scale.

4. Human factor: The simplest path to access

Even flawless architecture does not protect a system if access can be obtained through a user account. Weak passwords, lack of MFA, or phishing attacks remain among the most common entry points.

Red Team testing practice in corporate environments shows that weak passwords often become the first step toward internal access. And this is a typical scenario: simple access management mistakes are often more dangerous than complex technical vulnerabilities.

5. Business logic vulnerabilities: When the system behaves correctly but not as intended

The hardest cybersecurity weaknesses to find are those that do not look like errors. If an action is allowed by the system’s logic, it is not perceived as a threat, even if it allows rules to be bypassed.

Such scenarios are revealed during deep logic audits. For example, when testing KYC modules, our experts identified the absence of limits on requests or checks, which could allow document reuse or data enumeration.

Such logical cybersecurity vulnerabilities are typical for any services with transactional logic - from SaaS to enterprise systems.

Let’s summarize the types of cybersecurity vulnerabilities in a table:

Top 3 most common vulnerabilities identified by Datami

Statistics from our assessments show that, regardless of industry, most digital products face the same types of risks. They may manifest differently, depending on technology, architecture, or system scale, but their nature repeats. That is why practical experience allows our team to fairly accurately predict where vulnerable points should be searched for first.

Here are the top cybersecurity vulnerabilities most frequently identified by our experts:

1. Outdated components and dependencies

These are the undisputed leaders by frequency - they are even called the “disease” of scaling projects. Such vulnerabilities are typical consequences of rapid product development: new features are constantly added, while library control is postponed. As a result, components with already known vulnerabilities accumulate in the system. A similar pattern repeats across different environments, from online survey platforms to financial products such as currency exchange services. In all such cases, the cause is the same: dependencies were used without regular audits and version control.

2. Business logic errors

A very typical category for Web3/DeFi. Here, the issue is not the code itself, but the system’s operating rules. If the sequence of operations allows an unwanted scenario, formally everything works correctly - but the result may contradict business logic. Business logic vulnerabilities are common because they do not look like errors. They arise at the rule level rather than syntax, and therefore often remain unnoticed until an incident occurs.

3. Incorrect compiler handling

In practice, this appears as the use of floating versions or the absence of strict build environment pinning. What does this mean for business? Instability and difficulty in cybersecurity verification: the system may behave differently depending on the environment. In particular, we identified such risks during a smart contract audit before mainnet release, where undefined versions created potential compatibility issues and complicated the audit.

Top 3 most critical vulnerabilities from Datami’s practice

After analyzing the results of our cybersecurity assessments, it is worth highlighting three groups of the most dangerous vulnerabilities that lead to faster and more severe losses.

1. Reentrancy attacks

They allow an action to be executed multiple times before the system state is updated - for example, repeatedly withdrawing funds from a contract before the balance is updated. Such vulnerabilities can be detected, and these risks can be avoided through smart contract audits for Web3 companies.

2. Transaction logic flaws

This is a specific case within the category of business logic vulnerabilities, where weak points arise during the execution of a particular operation. In such cases, the sequence of actions or data integrity is violated from the perspective of business rules. The danger is that, despite seemingly normal system behavior, rules can be bypassed (such a case, in particular, was recorded during a smart contract audit of an original designer project). Scanners often miss such vulnerabilities, so manual auditing is required.

3. AI logic–related attacks

This is a new but promising category of cybersecurity vulnerabilities that many companies still do not take into account. In modern systems, artificial intelligence may process requests, data, or documents, and if validation works incorrectly, an attacker can influence system behavior by altering the logic of an AI agent to gain access to confidential data or force the system to perform unauthorized actions.

How we identify cybersecurity vulnerabilities

Often, a company learns about cybersecurity vulnerabilities only after an incident - when the system has already been breached or data compromised.

The Datami approach is the opposite: to find a potential entry point before an attacker does. Over 9 years of work, our team has tested a large number of cybersecurity systems and, based on our practical experience, we state that even in mature products, assessments typically reveal an average of about 15 real vulnerabilities, some of which internal teams definitely did not expect to see.

No single tool provides a complete picture of risks, so an effective assessment is built as a multi-layered security analysis model. In our view, the most effective vulnerability detection methods are:

• 24/7 monitoring detects suspicious activity as soon as it appears and enables a response before an incident.
• Penetration testing demonstrates how these vulnerabilities may look from the perspective of a real attack.
• Security audits show where potential weak points are embedded in code, architecture, or business logic.

After a cybersecurity assessment, we analyze and describe the identified vulnerabilities and provide recommendations on how to fix them. In other words, our clients receive not just a technical report, but a practical roadmap for strengthening cyber defense. A company understands what needs to be done and when: what must be fixed immediately and what should be added to the security roadmap.

What do we recommend to our clients?

Understanding types of vulnerabilities in cyber security is only the first step. In practice, most companies remain vulnerable not because of a lack of budget, but due to certain systemic mistakes in their approach to cybersecurity.

Why businesses often “don’t see” the threat

Before moving to technical solutions, it is important to recognize the psychological and organizational barriers that hinder protection:

• Focus on speed, not quality: in the race for deadlines and fast product releases (Time-to-Market), cybersecurity is often pushed aside. Code is written quickly, checked superficially, and “logical gaps” remain waiting for their hacker.
• Illusion of security: many companies operate under the belief, “We are too small and uninteresting for attackers.” This is a dangerous misconception, since modern attacks are often automated, and anyone can become a victim simply because their address appeared in a scanner’s list.
• Blind trust in tools: buying an expensive antivirus or firewall creates a false sense of complete safety. However, no tool can detect a flaw in your business process logic - only a human can.
• Excessive trust in teams or contractors: without an external independent audit, you see the system from only one angle, ignoring areas where developers may have simply become accustomed to existing flaws.

Datami recommendations on how to build real protection

Based on our cases and experience auditing real systems, we identify 7 critical steps to strengthen cybersecurity systems:

1. Basic access audit. Follow the principle of least privilege. Admin rights should be granted only to those who critically need them. Review user lists and make sure your test environments (staging) are closed from the external internet.
   
   
2. Multi-Factor Authentication (MFA). This is the simplest and most effective way to stop 90% of account attacks. MFA should be mandatory for all privileged accounts.
   
   
3. Regular software updates. Most successful attacks exploit already known and patched vulnerabilities (CVEs) - regularly update systems, applications, and libraries, because every day of delay gives attackers an advantage.
   
   
4. Vulnerability management. Cybersecurity is not a one-time action, but a process. Define who is responsible for vulnerability detection, how they are recorded, and be sure to set clear deadlines (SLA) for fixing them.
   
   
5. Regular penetration testing. Conduct testing not “for formality” once every few years, but after every major system update. This allows detection of logic errors that scanners cannot see.
   
   
6. Logging and monitoring. You must know what is happening in your system 24/7. Even if a vulnerability is fixed today, monitoring helps determine whether it was exploited yesterday.
   
   
7. Employee training. Technologies may be perfect, but humans remain the weakest link. Regular cybersecurity hygiene training helps recognize phishing - one of the most common entry points for attackers.

Conclusion

Practically every system has vulnerabilities. The only difference is who finds them first: cybersecurity specialists or hackers. Companies that regularly test the security of their products usually fix weak points in advance - calmly and without crises. Those who postpone assessments often encounter them only after an incident.

Therefore, the most effective cybersecurity strategy is not to wait for incidents, but to eliminate their likelihood in advance.