: Attackers use NULL because it is compatible with almost every data type (integers, strings, dates), making it the "safest" way to avoid syntax errors while testing column counts.
: If the number of NULL values does not match the original query's column count, the server usually returns an error (like a 500 Internal Server Error). : Attackers use NULL because it is compatible
: This is a SQL comment marker that tells the database to ignore the rest of the original query, preventing errors from leftover code. How it Works How it Works : This command attempts to
: This command attempts to append a new set of results to the original query's output. It is not a feature of a specific
: An attacker starts with one NULL and keeps adding more (e.g., NULL, NULL , then NULL, NULL, NULL ).
The string you provided is a classic payload. It is not a feature of a specific software product but rather a technique used by security researchers and attackers to probe databases for vulnerabilities. Purpose of the Payload