CVE-2025-9039 Information Disclosure in Amazon ECS Container Agent
An attacker in the same security group can access the ECS agent introspection server to disclose sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-9039?
CVE-2025-9039 is a medium-severity vulnerability in Amazon ECS, published on 14 Aug 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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).
Weakness: CWE-277
Which versions are affected by CVE-2025-9039?
3 open source packages ship an affected version, including github.com/aws/amazon-ecs-agent.
| Package | Affected | Fixed in |
|---|---|---|
github.com/aws/amazon-ecs-agent Go | From 0.0.3 | 1.97.1 |
github.com/aws/amazon-ecs-agent Go | From 0.0.3 | 1.97.1 |
github.com/aws/amazon-ecs-agent Go | From 0.0.3 | 1.97.1 |
How do I fix CVE-2025-9039?
Upgrade github.com/aws/amazon-ecs-agent to 1.97.1 or later.
Is CVE-2025-9039 being exploited?
There is no known exploitation of CVE-2025-9039 in the wild and no public exploit code.
Sources
Also known as GHSA-wm7x-ww72-r77q, GO-2025-3891.