Fetch-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f High Quality Online

In an SSRF attack, an attacker tricks a web server into making a request on their behalf. If an attacker finds a way to make your server "fetch" a URL of their choosing, they will point it at http://169.254.169 . Why this is a "Critical" Risk:

The address 169.254.0.0/16 is a link‑local range. It is , but it is accessible from within the same virtual network or host. EC2 instances are automatically configured to route this IP to the metadata service. For an attacker on the outside, the only way to reach it is by tricking the victim’s own server into making the request. In an SSRF attack, an attacker tricks a

fetch-url-http://169.254.169.254/latest/meta-data/iam/security-credentials/ It is , but it is accessible from

Security tools, web application firewalls (WAFs), and intrusion detection systems frequently decode this string to detect malicious intent. As a defender, you should look for both plain and encoded variants of 169.254.169.254 in request URIs, parameters, and headers. fetch-url-http://169

Imagine a web app that fetches images from user‑supplied URLs:

This URL is used in cloud environments, particularly on Amazon Web Services (AWS), to fetch temporary security credentials for an IAM role attached to an EC2 instance.