Curl-url-http-3a-2f-2f169.254.169.254-2flatest-2fapi-2ftoken _top_ May 2026

: You include that token in the header of all subsequent metadata requests. Breaking Down the Command

curl -H "X-aws-ec2-metadata-token: $TOKEN" http://169.254.169 Use code with caution. Why This Matters for Security

: Defines how long the token is valid (in this case, 21,600 seconds or 6 hours). Step 2: Access Metadata curl-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fapi-2Ftoken

The command curl -X PUT "http://169.254.169" -H "X-aws-ec2-metadata-token-ttl-seconds: 21600" is a critical component of modern cloud security within Amazon Web Services (AWS). It represents the transition from the legacy Instance Metadata Service Version 1 (IMDSv1) to the more secure . What is 169.254.169.254?

: IMDSv2 requires a PUT request to ensure that simple GET-based SSRF vulnerabilities cannot trigger a token generation. : You include that token in the header

The path http://169.254.169 is the gateway to secure instance management in AWS. If you are building or maintaining cloud infrastructure, ensuring your instances are configured to is a foundational security best practice that prevents credential theft via common web vulnerabilities.

The IP address is a link-local address used by AWS to provide the Instance Metadata Service (IMDS) . Every EC2 instance can query this address to retrieve information about itself—such as its instance ID, public IP, IAM role credentials, and security groups—without needing to call the AWS API externally. The Evolution: From IMDSv1 to IMDSv2 Step 2: Access Metadata The command curl -X

In the past (IMDSv1), metadata was accessible via a simple GET request. While convenient, this was vulnerable to attacks. If an attacker could trick a web application into making a request to that internal IP, they could steal sensitive IAM credentials.