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Template / PR Information
The original template never functioned.
Looking at the research in the reference the author states HOST header must equal the domain for the SSRF. So if interact in the URL it should be interact in the HOST.
https://gccybermonks.com/posts/cve-2021-40822/
Template Validation
The author of the research provided a vulnerable environment where you can see the original template did not function and this template should.
Clone the repository and start lab
Repository - https://github.com/phor3nsic/CVE-2021-40822
Start lab: docker-compose up
I've validated this template locally?