Cvss score extraction

Skill cxcscmu/SkillLearnBench/skills/b4-skill-creator-claude-opus-4-6/dependency-vulnerability-check/cvss-score-extraction

Extract CVSS (Common Vulnerability Scoring System) scores from vulnerability data sources with proper fallback handling. This skill covers understanding CVSS v3, handling multiple score sources (NVD, GHSA, RedHat), implementing source priority logic, and dealing with missing scores in security reporting.From its SKILL.md

Install

npx -y skills add cxcscmu/SkillLearnBench --skill cvss-score-extraction

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SKILL.md

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CVSS Score Extraction

Extract CVSS v3 scores from vulnerability data using a source priority cascade.

Source Priority

NVD → GHSA → RedHat → N/A

NVD (National Vulnerability Database) is most authoritative, followed by GitHub Security Advisories, then RedHat.

Data Structure (Trivy Format)

{
  "CVSS": {
    "nvd": { "V3Score": 9.8, "V2Score": 7.5 },
    "ghsa": { "V3Score": 9.8 }
  }
}

Python Implementation

def get_cvss_score(vuln_data):
    """Extract CVSS v3 score with source priority: NVD > GHSA > RedHat."""
    cvss = vuln_data.get('CVSS', {})
    if not isinstance(cvss, dict):
        return 'N/A'
    for source in ['nvd', 'ghsa', 'redhat']:
        if source in cvss and isinstance(cvss[source], dict):
            score = cvss[source].get('V3Score')
            if score is not None and isinstance(score, (int, float)):
                return score
    return 'N/A'

Score Ranges

Score	Severity
9.0-10.0	Critical
7.0-8.9	High
4.0-6.9	Medium
0.1-3.9	Low

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.