The Role of CVSS in Assessing AWS Security Risks

Introduction

Prioritizing security risks is crucial for efficient remediation. In this blog, we explain how CVSS (Common Vulnerability Scoring System) provides a standardized framework for assessing risks in your AWS environment.

What is CVSS?

CVSS is a scoring system that rates the severity of vulnerabilities on a scale of 0 to 10. Astaqc Consulting uses CVSS in its AWS audits to prioritize issues, such as:

Critical: Allowing traffic from 0.0.0.0/0 (any IP) to sensitive ports like SSH (22) or MySQL (3306) exposes your EC2 instances to attacks.
Mitigation: Restrict security group rules to specific IP ranges or use bastion hosts.

High: Unencrypted volumes can expose sensitive data during unauthorized access.Mitigation: Enable encryption by default for all EBS volumes.

Medium: IAM roles with excessive privileges or unused roles increase the attack surface.
Mitigation: Enforce least-privilege access and remove unused roles.

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