What is Common Weakness Enumeration (CWE)?
The Common Weakness Enumeration taxonomy is a community-developed classification of recurring software and hardware weakness types. A weakness is a condition in software, firmware, hardware, or a service that can contribute to a vulnerability under certain circumstances. CWE entries describe classes such as improper input validation rather than individual affected products.
CWE therefore differs from a vulnerability record. A Vulnerability is a specific flaw or exposure in a product or system, while CWE identifies the underlying weakness category that may help explain how such flaws arise.
What is CWE used for?
Developers, hardware designers, security architects, testers, and tool providers use CWE as a common language throughout the Software Development Lifecycle (SDLC). Teams can map findings to weakness types, analyze recurring root causes, define secure-development requirements, focus code review and testing, and connect results with resources such as the OWASP Top 10.
CWE supports prevention and comparison, but a classification alone does not establish exploitability, prevalence, or business impact in a particular environment. Security leaders should combine CWE-based trends with product context, threat evidence, and remediation data when setting engineering priorities or measuring whether Secure Development practices are reducing repeat weaknesses.
