# 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.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Aug 2025
- **Updated:** 14 Aug 2025
- **Also known as:** GHSA-wm7x-ww72-r77q, GO-2025-3891

## 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 (Insecure Inherited Permissions)

## Which versions are affected by CVE-2025-9039?

3 open source packages ship an affected version, including github.com/aws/amazon-ecs-agent.


| Package | Ecosystem | 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9039 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2025-9039 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/aws/amazon-ecs-agent (Go): affected from 0.0.3; fixed in 1.97.1
- github.com/aws/amazon-ecs-agent (Go): affected from 0.0.3; fixed in 1.97.1
- github.com/aws/amazon-ecs-agent (Go): affected from 0.0.3; fixed in 1.97.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-9039/ (Markdown: https://insights.sbomify.com/CVE-2025-9039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9039
- OSV: https://osv.dev/vulnerability/CVE-2025-9039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9039/
Summaries are generated and may contain mistakes; the official description above is the record.