We are announcing the public preview of the Default Rule Set 2.0 (DRS 2.0) for Azure Web Application Firewall (WAF) deployments running on Azure Front Door. This rule set is only available on the Azure Front Door Premium SKU.
DRS 2.0 includes the latest changes to our rule set, including the addition of anomaly scoring. With anomaly scoring, incoming requests are assigned an anomaly score when they violate WAF rules and an action is taken only when they breach an anomaly threshold. This helps drastically reduce false positives for customer applications. Also included in DRS2.0 are rules powered by Microsoft Threat Intelligence which offer increased coverage and patches for specific vulnerabilities.
See our managed rules documentation to learn more.