# CVE-2019-15800: Command injection in n/a

> Attackers can execute arbitrary commands on Zyxel GS1900 switches via input validation flaws in firmware functions, potentially leading to full device compromise.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 14 Nov 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-wgw9-xjmw-x98v

## What is CVE-2019-15800?

CVE-2019-15800 is a critical command injection vulnerability in n/a, published on 14 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. Due to lack of input validation in the cmd_sys_traceroute_exec(), cmd_sys_arp_clear(), and cmd_sys_ping_exec() functions in the libclicmd.so library contained in the firmware, an attacker could leverage these functions to call system() and execute arbitrary commands on the switches. (Note that these functions are currently not called in this version of the firmware, however an attacker could use other vulnerabilities to finally use these vulnerabilities to gain code execution.)

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

## Which versions are affected by CVE-2019-15800?

It affects 9 products.


Products: Zyxel Gs1900-10hp Firmware, Zyxel Gs1900-16 Firmware, Zyxel Gs1900-24 Firmware, Zyxel Gs1900-24e Firmware, Zyxel Gs1900-24hp Firmware, Zyxel Gs1900-48 Firmware, Zyxel Gs1900-48hp Firmware, Zyxel Gs1900-8 Firmware, Zyxel Gs1900-8hp Firmware.

## How do I fix CVE-2019-15800?

No fix has been published for CVE-2019-15800 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-15800 being exploited?

There is no known exploitation of CVE-2019-15800 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2026-7273](https://insights.sbomify.com/CVE-2026-7273/): Zyxel GS1900 Series Switches Stack-Based Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2015-5988](https://insights.sbomify.com/CVE-2015-5988/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2015-5989](https://insights.sbomify.com/CVE-2015-5989/): Auth bypass in n/a (critical 9.8)
- [CVE-2019-15803](https://insights.sbomify.com/CVE-2019-15803/): Auth bypass in n/a (critical 9.1)
- [CVE-2019-15799](https://insights.sbomify.com/CVE-2019-15799/): Privilege escalation in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-15800 and fix it if it is affected.

What it is: CVE-2019-15800 is a critical command injection vulnerability in n/a, published on 14 Nov 2019. 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-2019-15800 in the wild and no public exploit code.

Affected product: n/a. 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-2019-15800/ (Markdown: https://insights.sbomify.com/CVE-2019-15800/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15800
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15800
- OSV: https://osv.dev/vulnerability/CVE-2019-15800

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-15800/
Summaries are generated and may contain mistakes; the official description above is the record.