# CVE-2019-17186: Auth bypass in n/a

> Pre-authentication remote code execution is possible on FiberHome HG2201T routers via the telnet.cgi script.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Oct 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-m9vw-qv8f-44jp

## What is CVE-2019-17186?

CVE-2019-17186 is a high-severity authentication bypass vulnerability in n/a, published on 8 Oct 2019. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

/var/WEB-GUI/cgi-bin/telnet.cgi on FiberHome HG2201T 1.00.M5007_JS_201804 devices allows pre-authentication remote code execution.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2019-17186?

It affects 1 product.


Products: Fiberhome Hg2201t Firmware.

## How do I fix CVE-2019-17186?

No fix has been published for CVE-2019-17186 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-17186 being exploited?

There is no known exploitation of CVE-2019-17186 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2019-17187](https://insights.sbomify.com/CVE-2019-17187/): Path traversal in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-17186 and fix it if it is affected.

What it is: CVE-2019-17186 is a high-severity authentication bypass vulnerability in n/a, published on 8 Oct 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-17186 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-2019-17186/ (Markdown: https://insights.sbomify.com/CVE-2019-17186/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-17186
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-17186
- OSV: https://osv.dev/vulnerability/CVE-2019-17186

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-17186/
Summaries are generated and may contain mistakes; the official description above is the record.