The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
IceCast 2.20 allows remote attackers to bypass the XSL parser and obtain the source for XSL files via a request for a .xsl file with a trailing . (dot).