{keyword}') Waitfor Delay '0:0:5' And ('nndn'='nndn -

: A T-SQL command (used in Microsoft SQL Server) that instructs the system to wait for 5 seconds.

: Attempts to close the existing SQL query's syntax (like a string literal and parenthesis).

: Ensure all user-supplied data is validated and filtered before it reaches the backend.

It looks like you are testing for a vulnerability, specifically a time-based blind SQL injection .

: To fix this, developers should use prepared statements or parameterized queries rather than concatenating user input directly into SQL strings.