# CVE-2021-36321: Denial of service in Networking X-Series

> Remote unauthenticated attackers can cause denial of service on Dell Networking X-Series devices via improper input validation.

- **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:** 20 Nov 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-549x-x23c-r7qh

## What is CVE-2021-36321?

CVE-2021-36321 is a high-severity denial of service vulnerability in Dell Networking X-Series, published on 20 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Dell Networking X-Series firmware versions prior to 3.0.1.8 contain an improper input validation vulnerability. A remote unauthenticated attacker may potentially exploit this vulnerability by sending specially crafted data to trigger a denial of service.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-36321?

It affects 9 products.


Products: Dell X1008 Firmware, Dell X1008p Firmware, Dell X1018 Firmware, Dell X1018p Firmware, Dell X1026 Firmware, Dell X1026p Firmware, Dell X1052 Firmware, Dell X1052p Firmware, Dell X4012 Firmware.

## How do I fix CVE-2021-36321?

No fix has been published for CVE-2021-36321 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-36321 being exploited?

There is no known exploitation of CVE-2021-36321 in the wild and no public exploit code.

## Other vulnerabilities in Dell Networking X-Series

- [CVE-2021-36320](https://insights.sbomify.com/CVE-2021-36320/): Auth bypass in Networking X-Series (high 7.5)
- [CVE-2021-36322](https://insights.sbomify.com/CVE-2021-36322/): Open redirect in Networking X-Series (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36321 and fix it if it is affected.

What it is: CVE-2021-36321 is a high-severity denial of service vulnerability in Dell Networking X-Series, published on 20 Nov 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-2021-36321 in the wild and no public exploit code.

Affected product: Dell Networking X-Series. 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-2021-36321/ (Markdown: https://insights.sbomify.com/CVE-2021-36321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36321
- OSV: https://osv.dev/vulnerability/CVE-2021-36321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36321/
Summaries are generated and may contain mistakes; the official description above is the record.