# CVE-2016-8726: Null dereference in AWK-3131A Series Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client

> An attacker can cause a denial of service on Moxa industrial wireless access points by sending a malformed HTTP request with a blank header line.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Apr 2017
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-9qmp-f2hc-7j5x

## What is CVE-2016-8726?

CVE-2016-8726 is a high-severity vulnerability in Moxa AWK-3131A Series Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client, published on 13 Apr 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An exploitable null pointer dereference vulnerability exists in the Web Application /forms/web_runScript iw_filename functionality of Moxa AWK-3131A Wireless Access Point running firmware 1.1. An HTTP POST request with a blank line in the header will cause a segmentation fault in the web server.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2016-8726?

It affects 1 product.


Products: Moxa Awk-3131a Firmware.

## How do I fix CVE-2016-8726?

No fix has been published for CVE-2016-8726 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-8726 being exploited?

There is no known exploitation of CVE-2016-8726 in the wild and no public exploit code.

## Other vulnerabilities in Moxa AWK-3131A Series Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client

- [CVE-2017-14459](https://insights.sbomify.com/CVE-2017-14459/): Command injection in Moxa (critical 10.0)
- [CVE-2016-8717](https://insights.sbomify.com/CVE-2016-8717/): Hardcoded credentials in Moxa (critical 10.0)
- [CVE-2019-5138](https://insights.sbomify.com/CVE-2019-5138/): Command injection in Moxa (critical 9.9)
- [CVE-2019-5153](https://insights.sbomify.com/CVE-2019-5153/): Memory corruption in Moxa (critical 9.9)
- [CVE-2019-5162](https://insights.sbomify.com/CVE-2019-5162/): Missing authorization in Moxa (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-8726 and fix it if it is affected.

What it is: CVE-2016-8726 is a high-severity vulnerability in Moxa AWK-3131A Series Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client, published on 13 Apr 2017. 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-2016-8726 in the wild and no public exploit code.

Affected product: Moxa AWK-3131A Series Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client. 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-2016-8726/ (Markdown: https://insights.sbomify.com/CVE-2016-8726/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-8726
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-8726
- OSV: https://osv.dev/vulnerability/CVE-2016-8726

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-8726/
Summaries are generated and may contain mistakes; the official description above is the record.