# CVE-2021-20740: Command injection in Hitachi Virtual File Platform and NEC Storage M Series NAS Gateway which uses Hitachi Virtual File Platform

> Remote authenticated attackers can execute arbitrary OS commands with root privileges on Hitachi and NEC NAS gateways.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-8282-v8xm-6qqp

## What is CVE-2021-20740?

CVE-2021-20740 is a high-severity command injection vulnerability in Hitachi Virtual File Platform and NEC Storage M Series NAS Gateway which uses Hitachi Virtual File Platform, published on 28 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Hitachi Virtual File Platform Versions prior to 5.5.3-09 and Versions prior to 6.4.3-09, and NEC Storage M Series NAS Gateway Nh4a/Nh8a versions prior to FOS 5.5.3-08(NEC2.5.4a) and Nh4b/Nh8b, Nh4c/Nh8c versions prior to FOS 6.4.3-08(NEC3.4.2) allow remote authenticated attackers to execute arbitrary OS commands with root privileges via unspecified vectors.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2021-20740?

It affects 7 products.


Products: Hitachi Virtual File Platform, Nec Nas Gateway Nh4a Firmware, Nec Nas Gateway Nh4b Firmware, Nec Nas Gateway Nh4c Firmware, Nec Nas Gateway Nh8a Firmware, Nec Nas Gateway Nh8b Firmware, Nec Nas Gateway Nh8c Firmware.

## How do I fix CVE-2021-20740?

No fix has been published for CVE-2021-20740 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20740 being exploited?

There is no known exploitation of CVE-2021-20740 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20740 and fix it if it is affected.

What it is: CVE-2021-20740 is a high-severity command injection vulnerability in Hitachi Virtual File Platform and NEC Storage M Series NAS Gateway which uses Hitachi Virtual File Platform, published on 28 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-20740 in the wild and no public exploit code.

Affected product: Hitachi Virtual File Platform and NEC Storage M Series NAS Gateway which uses Hitachi Virtual File Platform. 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-2021-20740/ (Markdown: https://insights.sbomify.com/CVE-2021-20740/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20740
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20740
- OSV: https://osv.dev/vulnerability/CVE-2021-20740

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-20740/
Summaries are generated and may contain mistakes; the official description above is the record.