# CVE-2021-20679: Denial of service in Fuji Xerox multifunction devices and printers

> Attackers can cause denial of service and abnormal termination on Fuji Xerox multifunction devices by sending specially crafted commands.

- **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:** 25 Mar 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-pgh9-mf3w-56cj

## What is CVE-2021-20679?

CVE-2021-20679 is a high-severity denial of service vulnerability in Fuji Xerox multifunction devices and printers, published on 25 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Fuji Xerox multifunction devices and printers (DocuCentre-VII C7773/C6673/C5573/C4473/C3373/C3372/C2273, DocuCentre-VII C7788/C6688/C5588, ApeosPort-VII C7773/C6673/C5573/C4473/C3373/C3372 C2273, ApeosPort-VII C7788/C6688/C5588, ApeosPort C7070/C6570/C5570/C4570/C3570/C3070/C7070G/C6570G/C5570G/C4570G/C3570G/C3070G, ApeosPort-VII C4421/C3321, ApeosPort C3060/C2560/C2060/C3060G/C2560G/C2060G, ApeosPort-VII CP4421, ApeosPort Print C5570, ApeosPort 5570/4570/5570G/4570G, ApeosPort 3560/3060/2560/3560G/3060G/2560G, ApeosPort-VII 5021/ 4021, ApeosPort-VII P5021, DocuPrint CP 555 d/505 d, DocuPrint P505 d, PrimeLink C9065/C9070, DocuPrint CP475AP, and DocuPrint P475AP) allow an attacker to cause a denial of service (DoS) condition and abnormal end (ABEND) of the affected products via sending a specially crafted command.

## Which versions are affected by CVE-2021-20679?

It affects 75 products.


Products: Fujixerox Apeosport-Vii 4021 Firmware, Fujixerox Apeosport-Vii 5021 Firmware, Fujixerox Apeosport-Vii 5022 Firmware, Fujixerox Apeosport-Vii C2273 Firmware, Fujixerox Apeosport-Vii C3321 Firmware, Fujixerox Apeosport-Vii C3322 Firmware, Fujixerox Apeosport-Vii C3372 Firmware, Fujixerox Apeosport-Vii C3373 Firmware, Fujixerox Apeosport-Vii C4421 Firmware, Fujixerox Apeosport-Vii C4422 Firmware, Fujixerox Apeosport-Vii C4473 Firmware, Fujixerox Apeosport-Vii C5573 Firmware, Fujixerox Apeosport-Vii C5588 Firmware, Fujixerox Apeosport-Vii C6673 Firmware, Fujixerox Apeosport-Vii C6688 Firmware, Fujixerox Apeosport-Vii C7773 Firmware, Fujixerox Apeosport-Vii C7788 Firmware, Fujixerox Apeosport-Vii Cp3322 Firmware, Fujixerox Apeosport-Vii Cp4421 Firmware, Fujixerox Apeosport-Vii Cp4422 Firmware and 55 more.

## How do I fix CVE-2021-20679?

No fix has been published for CVE-2021-20679 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-20679 being exploited?

There is no known exploitation of CVE-2021-20679 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-20679 and fix it if it is affected.

What it is: CVE-2021-20679 is a high-severity denial of service vulnerability in Fuji Xerox multifunction devices and printers, published on 25 Mar 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-2021-20679 in the wild and no public exploit code.

Affected product: Fuji Xerox multifunction devices and printers. 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-2021-20679/ (Markdown: https://insights.sbomify.com/CVE-2021-20679/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-20679
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-20679
- OSV: https://osv.dev/vulnerability/CVE-2021-20679

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-20679/
Summaries are generated and may contain mistakes; the official description above is the record.