Scores and Calculators

Several sites provide easy ways to get CVSS scores. Several of the major ones are listed below.

CVSS Scores online

NIST NVD site has all alerts CVSS scored and presented at the below URL
http://nvd.nist.gov/nvd.cfm

They also have XML feeds that anyone can use
http://nvd.nist.gov/download.cfm#XML

ISS and X-force CVSS score all of their alerts
http://xforce.iss.net/xforce/alerts

Qualys
http://www.qualys.com/research/alerts/

Cisco
http://www.cisco.com/security

A link to Tenable's vulnerability checks is :
http://www.nessus.org/plugins/

Browsing a plugin reveals a CVSS score when available; eg,
http://www.nessus.org/plugins/index.php?view=single&id=23649

Security Database
http://www.security-database.com/cvss.php