# CVE-2020-5319: Denial of service in Unity

> Remote unauthenticated attackers can cause a storage processor panic and denial of service by sending malformed SSH protocol sequences to Dell EMC Unity systems.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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:** 6 Feb 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-c2m8-8qv3-5rrj

## What is CVE-2020-5319?

CVE-2020-5319 is a high-severity denial of service vulnerability in Dell Unity, published on 6 Feb 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Dell EMC Unity, Dell EMC Unity XT, and Dell EMC UnityVSA versions prior to 5.0.2.0.5.009 contain a Denial of Service vulnerability on NAS Server SSH implementation that is used to provide SFTP service on a NAS server. A remote unauthenticated attacker may potentially exploit this vulnerability and cause a Denial of Service (Storage Processor Panic) by sending an out of order SSH protocol sequence.

Weakness: CWE-129 (Improper Validation of Array Index)

## Which versions are affected by CVE-2020-5319?

It affects 3 products.


Products: Dell Emc Unity Operating Environment, Dell Emc Unity Xt Operating Environment, Dell Emc Unityvsa Operating Environment.

## How do I fix CVE-2020-5319?

No fix has been published for CVE-2020-5319 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5319 being exploited?

There is no known exploitation of CVE-2020-5319 in the wild and no public exploit code.

## Other vulnerabilities in Dell Unity

- [CVE-2021-36294](https://insights.sbomify.com/CVE-2021-36294/): Auth bypass in VNX Control Station (critical 9.8)
- [CVE-2021-36288](https://insights.sbomify.com/CVE-2021-36288/): Path traversal in VNX2 (high 8.6)
- [CVE-2021-36289](https://insights.sbomify.com/CVE-2021-36289/): Information disclosure in VNX Control Station (high 7.8)
- [CVE-2019-3741](https://insights.sbomify.com/CVE-2019-3741/): Information disclosure in Unity (high 7.8)
- [CVE-2018-11064](https://insights.sbomify.com/CVE-2018-11064/): Privilege escalation in Dell EMC Unity (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5319 and fix it if it is affected.

What it is: CVE-2020-5319 is a high-severity denial of service vulnerability in Dell Unity, published on 6 Feb 2020. 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-2020-5319 in the wild and no public exploit code.

Affected product: Dell Unity. 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-2020-5319/ (Markdown: https://insights.sbomify.com/CVE-2020-5319/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5319
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5319
- OSV: https://osv.dev/vulnerability/CVE-2020-5319

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5319/
Summaries are generated and may contain mistakes; the official description above is the record.