# CVE-2019-1839: Cisco Remote PHY Device Software Command Injection Vulnerability

> Authenticated local attackers can execute arbitrary commands as root on Cisco Remote PHY devices due to improper input sanitization.

- **Severity:** Medium 6.7 (`CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Aug 2019
- **Updated:** 20 Nov 2024
- **Also known as:** GHSA-6hf6-gmp8-5xw9

## What is CVE-2019-1839?

CVE-2019-1839 is a medium-severity command injection vulnerability in Cisco Remote PHY, published on 21 Aug 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in Cisco Remote PHY Device Software could allow an authenticated, local attacker to execute commands on the underlying Linux shell of an affected device with root privileges. The vulnerability occurs because the affected software improperly sanitizes user-supplied input. An attacker who has valid administrator access to an affected device could exploit this vulnerability by supplying various CLI commands with crafted arguments. A successful exploit could allow the attacker to run arbitrary commands as the root user, allowing complete compromise of the system.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2019-1839?

It affects 4 products.


Products: Cisco Cbr-8 Firmware, Cisco Remote Phy 120 Firmware, Cisco Remote Phy 220 Firmware, Cisco Remote Phy Shelf 7200 Firmware.

## How do I fix CVE-2019-1839?

No fix has been published for CVE-2019-1839 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-1839 being exploited?

There is no known exploitation of CVE-2019-1839 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-1839 and fix it if it is affected.

What it is: CVE-2019-1839 is a medium-severity command injection vulnerability in Cisco Remote PHY, published on 21 Aug 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-1839 in the wild and no public exploit code.

Affected product: Cisco Remote PHY. 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-2019-1839/ (Markdown: https://insights.sbomify.com/CVE-2019-1839/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-1839
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-1839
- OSV: https://osv.dev/vulnerability/CVE-2019-1839

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-1839/
Summaries are generated and may contain mistakes; the official description above is the record.