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Knowing what makes a software systems vulnerable to attacks is critical, as software vulnerabilities hurt security, reliability, and availability of the system as a whole. In addition, understanding how an adversary operates is essential to effective cyber security. The "software bug" concept applies to the Common Weakness Enumeration (CWE), the Common Vulnerabilities and Exposures (CVE), and the Common Attack Pattern Enumeration and Classification (CAPEC). Need For: (1) Precise descriptions of attacks (CAPECs) that lead to realization of vulnerabilities (CVEs), exposed by software weaknesses (CWEs). (2) Research to explore formalization of CWEs, CVEs, & CAPECs.