I’m assuming that by CVSS you mean Common Vulnerability Scoring System.
Considering that, CVSS cannot be used as a Risk Assessment Methodology for ISO 27001, because it is a framework for communicating the characteristics and severity of software vulnerabilities (based on three metric groups: Base, Temporal, and Environmental), which does not work with the concepts of likelihood and impact, required by the standard (clause 6.1.2 “d”).
The common uses of CVSS are for calculating the severity of the system’s vulnerabilities and for prioritizing vulnerability remediation activities.
These articles will provide you with further explanation about risk assessment and treatment:
I happened to see this paper entitled A Quantitative CVSS-Based Cyber Security Risk Assessment Methodology For IT Systems by Aksu et al: where they actually calculated Likelihood (or Probability) and Impact using CVSS metrics: https://cydecsys.com.tr/uploads/docs/1562668627_riskanalysiscarnahan2017.pdf
The proposed way to handle likelihood and impact in the paper sounds good, and would be acceptable to fulfill the standard’s requirements for risk assessment, although it is a bit complex when compared with other risk assessment approaches, like the asset-threat-vulnerability approach commonly adopted for ISO 27001 ISMS.