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Security & Compliance Glossary

CVSS (Common Vulnerability Scoring System)

CVSS, the Common Vulnerability Scoring System, is an open framework for rating the severity of a security vulnerability on a scale from 0.0 to 10.0. The score is derived from factors like how a flaw is exploited and the impact on confidentiality, integrity, and availability. Higher scores indicate more severe vulnerabilities.

In practice

CVSS bands map to labels: 0.1 to 3.9 is low, 4.0 to 6.9 medium, 7.0 to 8.9 high, and 9.0 to 10.0 critical. Teams use these scores to decide what to patch first.

The base score reflects the flaw in isolation; it is not a complete picture of your risk. A "critical" CVE on a system with no network exposure may matter less than a "medium" on an internet-facing one, which is why context still drives prioritization.

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Where it comes up

CVSS scores drive remediation SLAs in most vulnerability management policies, which is where they meet compliance: an auditor will compare your stated timeframe against what actually happened.

The trap is treating the base score as the risk. A 9.8 on a component you do not expose is less urgent than a 6.5 on your authentication path, and a policy that cannot express that produces either panic or ignored alerts.

CVSS (Common Vulnerability Scoring System): common questions

Is a high CVSS score always urgent?

No. CVSS base scores describe the vulnerability, not your environment. Exploitability in your specific configuration and exposure should drive the priority.

What CVSS thresholds should our policy use?

Whatever you can genuinely meet. Auditors compare your policy against your evidence, so a realistic thirty-day critical SLA you hit beats a seven-day one you miss.