# CVE-2020-3309: Cisco Firepower Device Manager On-Box Software Arbitrary File Overwrite Vulnerability

> An authenticated attacker can upload a malicious file to overwrite arbitrary files on the underlying operating system of Cisco Firepower devices.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 May 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-37wp-r5gr-q42h

## What is CVE-2020-3309?

CVE-2020-3309 is a medium-severity vulnerability in Cisco Firepower Threat Defense Software, published on 6 May 2020. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability in Cisco Firepower Device Manager (FDM) On-Box software could allow an authenticated, remote attacker to overwrite arbitrary files on the underlying operating system of an affected device. The vulnerability is due to improper input validation. An attacker could exploit this vulnerability by uploading a malicious file to an affected device. A successful exploit could allow the attacker to overwrite arbitrary files on as well as modify the underlying operating system of an affected device.

Weakness: CWE-787 (Out-of-bounds Write), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2020-3309?

It affects 1 product.


Products: Cisco Firepower Device Manager On-Box.

## How do I fix CVE-2020-3309?

No fix has been published for CVE-2020-3309 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3309 being exploited?

There is no known exploitation of CVE-2020-3309 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Firepower Threat Defense Software

- [CVE-2021-1518](https://insights.sbomify.com/CVE-2021-1518/): Cisco Firepower Device Manager On-Box Software Remote Code Execution Vulnerability (medium 6.3)
- [CVE-2020-3310](https://insights.sbomify.com/CVE-2020-3310/): Cisco Firepower Device Manager On-Box Software XML Parsing Vulnerability (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3309 and fix it if it is affected.

What it is: CVE-2020-3309 is a medium-severity vulnerability in Cisco Firepower Threat Defense Software, published on 6 May 2020. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-3309 in the wild and no public exploit code.

Affected product: Cisco Firepower Threat Defense Software. 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-2020-3309/ (Markdown: https://insights.sbomify.com/CVE-2020-3309/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3309
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3309
- OSV: https://osv.dev/vulnerability/CVE-2020-3309

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3309/
Summaries are generated and may contain mistakes; the official description above is the record.