Amazon ECS Agent <1.97.1: Off-Host Introspection Access via SG
CVE-2025-9039 Published on August 14, 2025
Information Disclosure in Amazon ECS Container Agent
We identified an issue in the Amazon ECS agent where, under certain conditions, an introspection server could be accessed off-host by another instance if the instances are in the same security group or if their security groups allow incoming connections that include the port where the server is hosted. This issue does not affect instances where the option to allow off-host access to the introspection server is set to 'false'.
This issue has been addressed in ECS agent version 1.97.1. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.
If customers cannot update to the latest AMI, they can modify the Amazon EC2 security groups to restrict incoming access to the introspection server port (51678).
Vulnerability Analysis
CVE-2025-9039 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
Insecure Inherited Permissions
A product defines a set of insecure permissions that are inherited by objects that are created by the program.
Products Associated with CVE-2025-9039
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Affected Versions
Amazon ECS:- Version 0.0.3 and below 1.97.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.