Understanding CVSS Scores: A Complete Guide
The Common Vulnerability Scoring System (CVSS) is a framework for rating the severity of security vulnerabilities. Understanding how CVSS works is essential for effective vulnerability management.
CVSS Base Score
The base score (0.0 to 10.0) represents the intrinsic characteristics of a vulnerability that are constant over time and across user environments. It considers three metrics:
- Attack Vector (AV): How the vulnerability can be exploited (network, adjacent, local, or physical)
- Attack Complexity (AC): Conditions beyond the attacker's control
- Privileges Required (PR): Level of privileges needed to exploit
CVSS Temporal Score
The temporal score adjusts the base score based on factors that change over time:
- Exploit Code Maturity (E): Availability of exploit code
- Remediation Level (RL): Availability of fixes
- Report Confidence (RC): Confidence in the vulnerability report
CVSS Environmental Score
The environmental score customizes the temporal score based on your specific environment, considering the security requirements and impact on your organization.
Interpreting CVSS Scores
While CVSS provides a standardized way to assess vulnerabilities, remember that it's just one factor in your prioritization process. Always consider your specific environment and business context.