# CVE-2021-40334: SSH activation problem in the proprietary management protocol (port TCP 5558)

> An attacker can disrupt network management communication by exploiting a missing handler in the proprietary management protocol on Hitachi Energy devices.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Dec 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-4cmw-rq6h-3v7m

## What is CVE-2021-40334?

CVE-2021-40334 is a high-severity missing authorization vulnerability in Hitachi Energy FOX61x, published on 2 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Missing Handler vulnerability in the proprietary management protocol (port TCP 5558) of Hitachi Energy FOX61x, XCM20 allows an attacker that exploits the vulnerability by activating SSH on port TCP 5558 to cause disruption to the NMS and NE communication. This issue affects: Hitachi Energy FOX61x versions prior to R15A. Hitachi Energy XCM20 versions prior to R15A.

Weakness: CWE-431 (Missing Handler)

## Which versions are affected by CVE-2021-40334?

It affects 2 products.


Products: Hitachienergy Fox615 Firmware, Hitachienergy Xcm20 Firmware.

## How do I fix CVE-2021-40334?

No fix has been published for CVE-2021-40334 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-40334 being exploited?

There is no known exploitation of CVE-2021-40334 in the wild and no public exploit code.

## Other vulnerabilities in Hitachi Energy FOX61x

- [CVE-2021-40333](https://insights.sbomify.com/CVE-2021-40333/): Weak default credential associated with TCP port 26 (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-40334 and fix it if it is affected.

What it is: CVE-2021-40334 is a high-severity missing authorization vulnerability in Hitachi Energy FOX61x, published on 2 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-40334 in the wild and no public exploit code.

Affected product: Hitachi Energy FOX61x. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2021-40334/ (Markdown: https://insights.sbomify.com/CVE-2021-40334/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-40334
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-40334
- OSV: https://osv.dev/vulnerability/CVE-2021-40334

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-40334/
Summaries are generated and may contain mistakes; the official description above is the record.