The term CRLF refers to Carriage Return (ASCII 13, \r) Line Feed (ASCII 10, \n). They're used to note the termination of a line, however, dealt with differently in today’s popular Operating Systems.
For example: in Windows, both a CR and LF are required to note the end of a line, whereas, In Linux/UNIX, LF is only required. In the HTTP protocol, the CR-LF sequence is always used to terminate a line.
A CRLF Injection attack occurs when a user manages to submit a CRLF into an application. This is most commonly done by modifying an HTTP parameter or URL.
CRLF Injection Payload
CRLF Injection Payloads 👉 %0D%0A
Vulnerability Threat Classification
Attack Category 👉 High
HackerOne Reports for Practicals
HTTP Response Splitting 👉 https://hackerone.com/reports/446271 HTTP Response Splitting 👉 https://hackerone.com/reports/53843 HTTP Response Splitting 👉 https://hackerone.com/reports/52042 CRLF Injection 👉 https://hackerone.com/reports/237357 CRLF Injection 👉 https://hackerone.com/reports/858650
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