# CVE-2018-11421: Information disclosure in n/a

> Remote attackers can intercept plain-text proprietary protocol traffic to steal administrator passwords and other sensitive data from Moxa OnCell devices.

- **Severity:** Critical 9.8 (`CVSS:3.0/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:** 3 Jul 2019
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-x8wq-f592-jcqf

## What is CVE-2018-11421?

CVE-2018-11421 is a critical vulnerability in n/a, published on 3 Jul 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Moxa OnCell G3100-HSPA Series version 1.6 Build 17100315 and prior use a proprietary monitoring protocol that does not provide confidentiality, integrity, and authenticity security controls. All information is sent in plain text, and can be intercepted and modified. The protocol is vulnerable to remote unauthenticated disclosure of sensitive information, including the administrator's password. Under certain conditions, it's also possible to retrieve additional information, such as content of HTTP requests to the device, or the previously used password, due to memory leakages.

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2018-11421?

It affects 2 products.


Products: Moxa Oncell G3150-Hspa-T Firmware, Moxa Oncell G3150-Hspa Firmware.

## How do I fix CVE-2018-11421?

No fix has been published for CVE-2018-11421 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-11421 being exploited?

There is no known exploitation of CVE-2018-11421 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-11420](https://insights.sbomify.com/CVE-2018-11420/): Memory corruption in n/a (critical 9.8)
- [CVE-2018-11422](https://insights.sbomify.com/CVE-2018-11422/): Missing authorization in n/a (critical 9.8)
- [CVE-2018-11426](https://insights.sbomify.com/CVE-2018-11426/): Auth bypass in n/a (critical 9.8)
- [CVE-2018-11427](https://insights.sbomify.com/CVE-2018-11427/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2018-11423](https://insights.sbomify.com/CVE-2018-11423/): Memory corruption in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-11421 and fix it if it is affected.

What it is: CVE-2018-11421 is a critical vulnerability in n/a, published on 3 Jul 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-2018-11421 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-2018-11421/ (Markdown: https://insights.sbomify.com/CVE-2018-11421/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-11421
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-11421
- OSV: https://osv.dev/vulnerability/CVE-2018-11421

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-11421/
Summaries are generated and may contain mistakes; the official description above is the record.