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Definition of Vuln by the free dictionary. To wound (oneself) by biting at the breast. Used of the pelican, which was once believed to feed its young with its blood, as a heraldic motif and symbol of Christ.
Wiktionary. (heraldry, especially of a pelican) To wound (oneself) by biting at the breast. The shield depicts a pelican vulning herself.··(computing, informal) Vulnerability (weakness in software etc. that can be maliciously exploited).
Vulnerabilities. Vulnerabilities. CVE defines a vulnerability as: "A weakness in the computational logic (e.g., code) found in software and hardware components that, when exploited, results in a negative impact to confidentiality, integrity, or availability.