The CWE Top 25 Most Dangerous Software Weaknesses is an annual list compiled by MITRE that demonstrates the most widespread and critical software weaknesses. The list is calculated from real-world vulnerability data in the National Vulnerability Database (NVD), providing a data-driven view of the most impactful security issues affecting software today.

The 2024 list is based on analysis of 31,770 CVE records. Each CWE is scored using a formula that considers: (1) the prevalence of the weakness (how many CVEs reference it), (2) the average severity (CVSS score) of those vulnerabilities, and (3) additional weighting factors. The result is a prioritized list of the weaknesses causing the most security harm.

MITRE publishes an updated CWE Top 25 list annually, typically in June. Each year's list is based on CVE data from the previous 1-2 years, ensuring it reflects current threat trends. The list helps organizations adjust their security priorities as new weakness patterns emerge and existing ones evolve.

Trend indicators show how each CWE's ranking changed from the previous year: (1) Green ↑ arrows indicate improved ranking (moved up the list, better position), (2) Red ↓ arrows show declined ranking (moved down, worse position), (3) Blue stars (★) mark NEW entries that weren't in the previous year's Top 25, and (4) Gray dashes (—) indicate the rank stayed the same.

The CWE Top 25 helps you prioritize security efforts where they'll have the most impact. Use it to: (1) Focus developer training on the most critical weaknesses, (2) Configure static analysis tools to detect Top 25 patterns, (3) Prioritize remediation of findings that match Top 25 weaknesses, (4) Align security investments with real-world data, and (5) Communicate security priorities to stakeholders using industry-recognized data.

These three metrics provide different perspectives: (1) CVE Count shows how often this weakness appears in real vulnerabilities (prevalence), (2) Avg CVSS indicates the typical severity when this weakness is exploited (impact), and (3) Score is MITRE's calculated ranking that combines prevalence, severity, and other factors to determine overall danger level. A high score means both common and severe.

Yes! Use the year selector to switch between different annual lists. The tool automatically shows trend indicators when comparing consecutive years, highlighting new entries, dropped weaknesses, and rank changes. This helps you track how the threat landscape evolves and identify emerging security concerns.

Many security frameworks reference CWE Top 25 as a baseline for secure development. Use this tool to: (1) Document your organization's awareness of current threats, (2) Map vulnerability scan findings to Top 25 categories, (3) Demonstrate due diligence by addressing industry-recognized critical weaknesses, (4) Create security roadmaps based on data-driven priorities, and (5) Generate reports showing how your remediation efforts align with Top 25 weaknesses.

Top 3 weaknesses (Cross-site Scripting, Out-of-bounds Write, SQL Injection) represent the most critical security issues. Prioritize remediation immediately: (1) Isolate affected code/systems, (2) Review MITRE's detailed mitigation strategies by clicking the CWE entry, (3) Implement proper input validation and output encoding, (4) Deploy additional security controls while developing fixes, and (5) Consider this a high-priority security incident requiring rapid response.

Prevention strategies include: (1) Training developers on secure coding practices for Top 25 weaknesses, (2) Using static analysis tools configured to detect these patterns, (3) Implementing security frameworks that provide built-in protections, (4) Conducting code reviews focused on Top 25 categories, (5) Following MITRE's phase-specific mitigation strategies (requirements, design, implementation, testing), and (6) Regularly updating dependencies to include security patches.