The address 169.254.169.254 is a used by Amazon Web Services (AWS) to provide the Instance Metadata Service (IMDS) . Every EC2 instance can "talk" to this IP to learn about itself without needing an external internet connection.
The IP address is a link-local address accessible only from within an EC2 instance. It hosts the Instance Metadata Service (IMDS) , which provides details about the instance's configuration, including: Instance ID and hostname. The address 169
If you're working with AWS, this URL is crucial for getting security credentials programmatically from within an EC2 instance. It hosts the Instance Metadata Service (IMDS) ,
The danger arises when an application has a vulnerability called . : These credentials are used for applications running
: These credentials are used for applications running on EC2 instances to securely access other AWS services without needing to store long-term credentials on the instance.
The AWS Instance Metadata Service (IMDS) endpoint at http://169.254.169.254/latest/meta-data/iam/security-credentials/ allows EC2 instances to retrieve temporary, auto-rotated IAM security credentials, eliminating the need to hardcode long-term keys. While IMDSv1 is susceptible to Server-Side Request Forgery (SSRF) attacks, AWS strongly advises adopting IMDSv2 to enforce session-oriented authentication and mitigate credential theft risks. For official technical steps, refer to the AWS User Guide on retrieving credentials .
: Accessing iam/security-credentials/ returns the name of the IAM role associated with the instance.