# CVE-2022-34840: Hardcoded credentials in Buffalo network devices

> A network-adjacent attacker can use hard-coded credentials to alter configuration settings on multiple Buffalo network devices.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **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:** 7 Dec 2022
- **Updated:** 23 Apr 2025
- **Also known as:** GHSA-pgrg-rvjm-c6vq

## What is CVE-2022-34840?

CVE-2022-34840 is a medium-severity vulnerability in Buffalo network devices, published on 7 Dec 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Use of hard-coded credentials vulnerability in multiple Buffalo network devices allows a network-adjacent attacker to alter?configuration settings of the device. The affected products/versions are as follows: WZR-300HP firmware Ver. 2.00 and earlier, WZR-450HP firmware Ver. 2.00 and earlier, WZR-600DHP firmware Ver. 2.00 and earlier, WZR-900DHP firmware Ver. 1.15 and earlier, HW-450HP-ZWE firmware Ver. 2.00 and earlier, WZR-450HP-CWT firmware Ver. 2.00 and earlier, WZR-450HP-UB firmware Ver. 2.00 and earlier, WZR-600DHP2 firmware Ver. 1.15 and earlier, and WZR-D1100H firmware Ver. 2.00 and earlier.

Weakness: CWE-798 (Use of Hard-coded Credentials)

## Which versions are affected by CVE-2022-34840?

It affects 9 products.


Products: Buffalo Hw-450hp-Zwe Firmware, Buffalo Wzr-300hp Firmware, Buffalo Wzr-450hp-Cwt Firmware, Buffalo Wzr-450hp-Ub Firmware, Buffalo Wzr-450hp Firmware, Buffalo Wzr-600dhp2 Firmware, Buffalo Wzr-600dhp Firmware, Buffalo Wzr-900dhp Firmware, Buffalo Wzr-D1100h Firmware.

## How do I fix CVE-2022-34840?

No fix has been published for CVE-2022-34840 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-34840 being exploited?

There is no known exploitation of CVE-2022-34840 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-34840 and fix it if it is affected.

What it is: CVE-2022-34840 is a medium-severity vulnerability in Buffalo network devices, published on 7 Dec 2022. 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-2022-34840 in the wild and no public exploit code.

Affected product: Buffalo network devices. 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-2022-34840/ (Markdown: https://insights.sbomify.com/CVE-2022-34840/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-34840
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-34840
- OSV: https://osv.dev/vulnerability/CVE-2022-34840

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-34840/
Summaries are generated and may contain mistakes; the official description above is the record.