Security
CRS
Abbreviation for Core Rule Set
In short and in plain language
CRS is an open-source set of rules.
It is made for firewalls that protect web applications. Its rules spot common kinds of attack in a general way.
Operators can use it as a base for their own rules.
Definition
CRS refers to an open-source rule set of the OWASP project for web application firewalls. It collects generic detection rules against common classes of attack. Operators can use it as a basis for their own rules.