API Attacks: Potential Threats to Businesses

Latest Update: 19/01/2024

API Attacks: Potential Threats to Businesses

According to Report Linker, the global API security market is projected to grow from $744 million in 2023 to $3,034 million in 2028. This significant market growth is driven by the increasing number of API-related attacks, which directly impact the operations of businesses. So, how do API attacks affect businesses and how to secure APIs effectively, let's explore in the following article.

Learn about API attacks

What are API attacks ?

API (Application Programming Interface) attacks involve exploiting vulnerabilities in the application programming interface to gain unauthorized access, manipulate data, or disrupt services. This type of attack is prevalent in the web application development environment, with the primary objective of leveraging security flaws in the deployment, management, and protection of APIs.

Types of API attacks

Injection attacks:

  • SQL Injection: Injecting malicious SQL commands through API parameters to execute unauthorized queries and gather sensitive information from the database.
  • XPath Injection: Similar to SQL Injection, but instead of targeting the database, attackers seek to interfere with XPath queries used in the API.

Cross-Site Scripting (XSS) attacks:

This attack often occurs when the API returns improperly processed data, allowing attackers to inject malicious JavaScript code into other websites or applications.

Man-in-the-Middle (MitM) attacks:

Hackers can monitor and modify data transmitted through the API between parties to steal sensitive information or carry out other attacks.

Cross-Site Request Forgery (CSRF) attacks:

Attackers attempt to execute unauthorized requests from authenticated users to perform unwanted actions.

Unauthorized Access:

Attempting to access unauthorized resources and functions through the API by modifying requests or discovering authentication vulnerabilities.

Denial of Service (DoS) Attacks:

An attack aimed at halting or reducing the performance of the API by sending a large volume of unreasonable requests or exploiting other system vulnerabilities.

Misconfigured Security Settings:

Exploiting incorrect settings, configuration errors, and insecure access permissions within the API.

Impact of API attacks on businesses

Security risks:

Being subjected to API attacks can lead to the theft or alteration of sensitive business information, such as customer data, financial information, business strategies, etc. This not only affects business capabilities but also poses a serious threat to privacy and the reputation of the enterprise.

Service disruptions:

API attacks can cause applications unable to function normally, causing slowdowns, freezes, or complete shutdowns. This can impact the ability to deliver products, services, functionalities, content, etc., causing inconvenience and directly affecting user experience, business operations, and the reputation of the enterprise.

Financial losses:

API attacks can result in financial losses for the business, including revenue loss, customer loss, market share loss, missed business opportunities, and investment loss. Financial losses also create significant pressure on the financial resources of the business, impacting its ability to invest in other critical business activities.

Brand reputation damage:

API attacks can damage a business's image, reputation, credibility, trust, etc. with customers and partners. This can reduce brand value and negatively impact a business's operations.

Challenges in securing APIs against attacks:

The integration of multiple applications leads to the use of multiple APIs, making API security an increasingly urgent and complex issue for businesses.

Authentication and authorization:

User authentication and access management are crucial aspects of API security. Consistency in authentication processes and role management can be challenging due to system complexity and the diversity of users and roles.

SSL/TLS encryption deployment:

The costs associated with purchasing SSL certificates and the resources required for deploying and maintaining SSL/TLS connections can be burdensome for organizations, particularly small enterprises. Additionally, incorrect SSL/TLS configuration can create security vulnerabilities and compromise system safety.

Session and token management:

Inadequate session management or insecure token storage can lead to session hijacking, session fixation, or the risk of authentication information theft.

API version management:

Lack of clear decisions on when to upgrade versions can result in inconsistency within the system. This can lead to incompatibility issues and create security vulnerabilities for hackers to exploit.

Regular security scanning:

Failure to regularly update security technology can diminish the ability to face increasingly complex threats. Additionally, irregular user access checks may create new security vulnerabilities due to changes in user access rights.

Optimal API security methods for businesses

Strict authentication and access control management:

Implementing MFA (Multi-Factor Authentication):

MFA is an extremely effective additional layer of security to protect accounts from Brute Force attacks. It requires users to authenticate via at least two different authentication methods such as passwords, OTP codes, or fingerprints. Implementing MFA provides an additional layer of security, reducing the risk of weak or stolen passwords.

Implementing RBAC (Role-Based Access Control):

RBAC helps organizations manage access more tightly by defining the roles and permissions of each user. This not only helps reduce the risk of abuse, but also increases flexibility and efficiency in access management.

SSL/TLS deployment and maintenance:

Integrate Let's Encrypt or SSL/TLS:

Services like Let's Encrypt provide free SSL certificates, reducing costs and increasing readiness to deploy HTTPS. Ensure correct SSL/TLS configuration to prevent Man-in-the-Middle attacks.

Optimize SSL/TLS performance:

Optimize the SSL/TLS configuration to reduce the impact on system performance. Use technologies like TLS 1.3, leverage caching mechanisms, and use hardware-supported servers to improve encryption and decryption performance.

Secure session and token management:

Secure session and token management play an important role in API security, especially when using JSON Web Tokens (JWT). For JWT, the choice of signing and encryption algorithms determines the security of the token. Use strong algorithms and encryption such as RSA with RS256 to ensure the integrity and security of the information in the token.

In addition, it is necessary to limit the information in the token to only the necessary information to identify the identity and permissions of the user. Set a short lifetime and implement a secure refresh mechanism to avoid the token being used for a long time, reducing the risk of exploitation.

API version management:

Regular security checks are crucial to ensure system safety. Use automated security testing tools to assess the system continuously and detect security vulnerabilities. Conduct regular source code reviews to identify and address source code vulnerabilities, especially those related to session and token management. Employ a combination of tools and testing methods for accurate and comprehensive security checks.

This includes testing applications, databases, APIs, and external services. Examine the relationships between components to ensure no security gaps are created, maintaining the system's security integrity.

Lastly, integrate security testing into the software development process from the beginning, applying the principles of the Security Development Lifecycle (SDLC). This ensures that security is not merely an add-on but an integral and proactive part of the development process.

VNIS - Leading API security solution provider in Asia

With the VNIS security solution, businesses can be assured that their systems will be fully and effectively protected from complex and large-scale API attacks as they are today, while still ensuring stable operation.

API3.png VNIS comprehensive protection model

The VNIS platform commits to providing peace of mind for businesses in safeguarding their systems against all network attacks, including:

  • Application of AI and Bot mitigation: Provides the ability to manage and detect bot traffic accessing the system, helping to prevent timely attacks from malicious bots.
  • Comprehensive API access monitoring: An interactive dashboard helps you control the number of API access blocked and make appropriate security decisions.
  • Flexible customization of security rules: Customize security rules according to the needs of the business to ensure maximum safety for web applications and APIs.
  • Strict access control: Block any unauthorized access to web applications and APIs, only authorized users can access data.
  • Strong DoS/DDoS mitigation capabilities: VNIS is committed to effectively dealing with DoS/DDoS attacks up to thousands of Tbps. A robust CDN system with a load capacity of up to 2,600 Tbps helps ensure availability and stability in the face of any attack.
  • 24/7 SOC monitoring system: Continuous monitoring, analysis, and reporting system, helping businesses respond to cyber attacks effectively.
  • Integration of secure and flexible features: Ensures a balance between performance and security for the business's system with Cloud WAF, DDoS Protection, Bot Management, etc.


In the increasingly complex landscape of cybersecurity today and the diverse range of security service providers, choosing a comprehensive and suitable security solution is a crucial strategy for businesses. It can determine success or failure in securing systems against cyber attacks and ensuring stable business operations.

Given the mission to protect clients' websites, applications, and APIs from ever- evolving threats, the VNIS platform offers a comprehensive security solution. This includes preventing attacks at both the network and application layers. The VNIS solution is designed by VNETWORK to be flexible, capable of adapting to the constantly changing security environment to provide the highest effectiveness in prevention and response for businesses. For consultation and detailed pricing, please contact VNETWORK by Hotline: +84 (028) 7306 8789 or

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