What Is CWE (Common Weakness Enumeration)?

The Common Weakness Enumeration provides a comprehensive list of typical vulnerabilities in hardware and software. This freely accessible list categorizes all known security vulnerabilities, making it the ideal foundation for identifying and resolving security-related weaknesses.

What CWE Means

The abbreviation CWE stands for Common Weakness Enumeration and refers to a systematic catalog of different vulnerability types. These affect both hardware and software and are regularly maintained by the community. Each vulnerability is categorized and assigned a unique ID for reliable identification.

The primary goal of this list is to provide a solid foundation for preventing and eliminating typical security vulnerabilities. It delivers the essential information your Security Operations Center needs and supports you in taking the necessary countermeasures. For this reason, the MITRE Corporation has been regularly publishing this freely accessible catalog since 2006. The entries it contains are not only relevant to CWE Security -- they also help software developers and security officers prevent risks in hardware and software.

CWE -- What Counts as a Vulnerability?

CWE Security covers all errors in software and hardware systems that can lead to security issues. If left unaddressed, these vulnerabilities can serve cybercriminals as a gateway into your organization.

With more than 900 categorized vulnerabilities, the database provides your security operations center with an essential guide. Since keeping track of that many entries is challenging, the CWE Top 25 highlights the most dangerous vulnerabilities with the highest potential impact on your business. While hard-coded passwords tend to rank lower, the most serious types include SQL injections and cross-site scripting issues.

What Are the Goals of CWE?

As Cloud Transformation progresses, the demands on IT security in your organization continue to grow. It is therefore essential to eliminate critical security vulnerabilities through pentests and Open Source Intelligence. The Common Weakness Enumeration helps you focus on the most pressing issues. It pursues the following goals:

• CWE identifies typical errors and weaknesses in hardware and software solutions so that problems can be fixed before the affected systems are deployed in your organization.
• The catalog supports developers, programmers, and security analysts in their daily work.
• It enables the community to discuss and describe vulnerabilities using a common language.
• Beyond listing typical weaknesses, it provides conceptual approaches and sample solutions you can use as guidance.

What Makes CWE Different from OWASP and Others?

Secure programming practices have always been important, but they have become indispensable since the digital and cloud transformation. As a result, numerous guidelines now exist to support programmers and security researchers. Among the most important are CWE, OWASP, and CVE.

• CVE: A list of known vulnerabilities in enterprise resources and cybersecurity weaknesses.
• CWE: A comprehensive vulnerability database that helps you identify weaknesses and address security issues. This collection draws on data from both OWASP and the CVE inventory.
• OWASP: This community initiative regularly publishes the top 10 vulnerabilities -- the most dangerous security flaws found in web applications.

How Does CWE Work?

The vulnerabilities listed in CWE are ranked based in part on a scoring calculation. This calculation assigns a weight to each factor, which is then projected onto different areas: Base Findings, Environmental, and Attack Surface. The resulting subscores determine the overall CWE score and the ranking within the CWE Security List.

However, not all entries represent specific threats that have been individually assessed. Some items on the vulnerability list are intentionally generic, making them difficult to apply directly in your organization. Certain security threats can therefore only be uncovered through active security measures such as pentests, which help you find and close security gaps. Nevertheless, the vulnerabilities cataloged in CWE provide valuable guidance and highlight which components require special attention during a pentest.

The Most Common Vulnerabilities According to CWE

The Common Weakness Enumeration is an essential tool for IT security. Combined with Open Source Intelligence, it enables you to systematically search for risks in your organization. You should review not only the top entries on the list but also fundamental security vulnerabilities. The most common weaknesses encountered in enterprise environments include the following.

Out-of-Bounds Write

In this type of vulnerability, an application writes data to areas outside the intended input buffer. These problems typically occur when an index changes or pointer arithmetic is used, causing a reference to a memory location that is no longer within the buffer. The consequences can include data corruption, system crashes, or unintended code execution.

Out-of-Bounds Read

Similar to Out-of-Bounds Write, this vulnerability also involves access outside the intended buffer. The difference is that it allows reading information beyond the output buffer boundaries. This enables cybercriminals to extract sensitive data or obtain secret values. Particularly dangerous is the fact that Out-of-Bounds Read can be used to bypass authentication mechanisms. It is therefore no surprise that this vulnerability also ranks very high on the CWE scale.

Input Neutralization

This vulnerability occurs when malicious code is injected into websites. Also known as cross-site scripting, it frequently appears in dynamically generated web pages. When these pages accept untrusted data without proper neutralization, the injected script triggers unwanted actions. This vulnerability has grown significantly in importance in recent years and is prominently featured on the CWE list.

Input Validation

Applications that accept input data must validate it appropriately. This validation ensures that inputs possess the required characteristics for secure processing. If this check is missing, a security vulnerability is created that attackers can exploit to deliver unexpected input or execute remote code. The result is a modified control flow path in the application that can override the underlying architectural design.

CWE: MITRE Regularly Names the Top 25 Vulnerabilities

To help you target the components with the highest threat potential during pentesting, MITRE regularly publishes the top 25 vulnerabilities. These are relevant not only for pentesting but also when purchasing or developing new products. The regularly updated list provides a solid overview of current threats, including authentication problems, critical functions, hard-coded passwords, and Cross-Site Request Forgery. The broad spectrum of vulnerabilities demonstrates that regular testing is essential, since cybercriminals are well aware of these security risks. To protect your organization and its sensitive business data, IT security should be a top priority.

That said, the top 25 vulnerabilities alone will not eliminate every problem. Every business is unique, and the same applies to its security challenges. It therefore makes sense to have an expert realistically assess your specific vulnerability risks. This approach helps you effectively address the individual security gaps within your organization.