Curl-url-file-3a-2f-2f-2f

curl -X POST -d "url=file%3A%2F%2F%2Fetc%2Fpasswd" https://vulnerable-app/fetch

(Note: The standard syntax is simply curl file:///path/to/file . The word "url" in your string is likely part of a variable name, a typo in the exploit script, or a flag meant to be parsed by a specific tool.) curl-url-file-3A-2F-2F-2F

The following essay explores the technical, ethical, and security implications of this specific syntax. The Digital Skeleton Key: Understanding curl file:/// a typo in the exploit script

So, 3A-2F-2F-2F decodes to :/:/// .