# CVE-2016-7821: Denial of service in WNC01WH

> Remote attackers can cause a denial of service against the management interface of Buffalo WNC01WH devices.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 9 Jun 2017
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-93h9-hmfg-qcx2

## What is CVE-2016-7821?

CVE-2016-7821 is a medium-severity denial of service vulnerability in BUFFALO INC. WNC01WH, published on 9 Jun 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Buffalo WNC01WH devices with firmware version 1.0.0.8 and earlier allow remote attackers to cause a denial of service against the management screen via unspecified vectors.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2016-7821?

It affects 1 product.


Products: Buffalotech Wnc01wh Firmware.

## How do I fix CVE-2016-7821?

No fix has been published for CVE-2016-7821 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-7821 being exploited?

There is no known exploitation of CVE-2016-7821 in the wild and no public exploit code.

## Other vulnerabilities in BUFFALO INC. WNC01WH

- [CVE-2016-7822](https://insights.sbomify.com/CVE-2016-7822/): Cross-site request forgery in WNC01WH (high 8.8)
- [CVE-2016-7824](https://insights.sbomify.com/CVE-2016-7824/): Security feature bypass in WNC01WH (high 8.8)
- [CVE-2016-7825](https://insights.sbomify.com/CVE-2016-7825/): Path traversal in WNC01WH (medium 6.5)
- [CVE-2016-7826](https://insights.sbomify.com/CVE-2016-7826/): Path traversal in WNC01WH (medium 6.5)
- [CVE-2016-7823](https://insights.sbomify.com/CVE-2016-7823/): Cross-site scripting in WNC01WH (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-7821 and fix it if it is affected.

What it is: CVE-2016-7821 is a medium-severity denial of service vulnerability in BUFFALO INC. WNC01WH, published on 9 Jun 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2016-7821 in the wild and no public exploit code.

Affected product: BUFFALO INC. WNC01WH. 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-2016-7821/ (Markdown: https://insights.sbomify.com/CVE-2016-7821/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-7821
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-7821
- OSV: https://osv.dev/vulnerability/CVE-2016-7821

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-7821/
Summaries are generated and may contain mistakes; the official description above is the record.