# CVE-2018-5449: Null dereference in Moxa OnCell G3100-HSPA Series

> An attacker can cause a denial of service on Moxa OnCell G3100-HSPA devices by triggering a null pointer dereference.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Mar 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-836c-7qj9-w7cj

## What is CVE-2018-5449?

CVE-2018-5449 is a medium-severity vulnerability in Moxa OnCell G3100-HSPA Series, published on 5 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A NULL Pointer Dereference issue was discovered in Moxa OnCell G3100-HSPA Series version 1.4 Build 16062919 and prior. The application does not check for a NULL value, allowing for an attacker to perform a denial of service attack.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2018-5449?

It affects 4 products.


Products: Moxa Oncell G3110-Hspa-T Firmware, Moxa Oncell G3110-Hspa Firmware, Moxa Oncell G3150-Hspa-T Firmware, Moxa Oncell G3150-Hspa Firmware.

## How do I fix CVE-2018-5449?

No fix has been published for CVE-2018-5449 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-5449 being exploited?

There is no known exploitation of CVE-2018-5449 in the wild and no public exploit code.

## Other vulnerabilities in Moxa OnCell G3100-HSPA Series

- [CVE-2018-5455](https://insights.sbomify.com/CVE-2018-5455/): Auth bypass in Moxa OnCell G3100-HSPA Series (critical 9.8)
- [CVE-2018-5453](https://insights.sbomify.com/CVE-2018-5453/): Denial of service in Moxa OnCell G3100-HSPA Series (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-5449 and fix it if it is affected.

What it is: CVE-2018-5449 is a medium-severity vulnerability in Moxa OnCell G3100-HSPA Series, published on 5 Mar 2018. 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-2018-5449 in the wild and no public exploit code.

Affected product: Moxa OnCell G3100-HSPA Series. 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-2018-5449/ (Markdown: https://insights.sbomify.com/CVE-2018-5449/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-5449
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-5449
- OSV: https://osv.dev/vulnerability/CVE-2018-5449

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-5449/
Summaries are generated and may contain mistakes; the official description above is the record.