# CVE-2026-33366: Missing authorization in BUFFALO Wi-Fi router products

> Attackers can forcibly reboot BUFFALO Wi-Fi routers without authentication, causing a denial of service.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2026
- **Updated:** 27 Mar 2026
- **Also known as:** GHSA-h3gg-7vcj-v4m8

## What is CVE-2026-33366?

CVE-2026-33366 is a medium-severity missing authorization vulnerability in BUFFALO Wi-Fi router products, published on 27 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Missing authentication for critical function vulnerability in BUFFALO Wi-Fi router products may allow an attacker to forcibly reboot the product without authentication.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-33366?

It affects 46 products.


Products: Buffalo Fs-M1266 Firmware, Buffalo Fs-S1266 Firmware, Buffalo Vr-U300w Firmware, Buffalo Vr-U500x Firmware, Buffalo Wapm-1266r Firmware, Buffalo Wapm-1266wdpr Firmware, Buffalo Wapm-1266wdpra Firmware, Buffalo Wapm-1750d Firmware, Buffalo Wapm-2133r Firmware, Buffalo Wapm-2133tr Firmware, Buffalo Wapm-Ax4r Firmware, Buffalo Wapm-Ax8r Firmware, Buffalo Wapm-Axetr Firmware, Buffalo Waps-1266 Firmware, Buffalo Waps-Ax4 Firmware, Buffalo Wcr-1166dhpl Firmware, Buffalo Wem-1266 Firmware, Buffalo Wem-1266wp Firmware, Buffalo Wrm-D2133hp Firmware, Buffalo Wrm-D2133hs Firmware and 26 more.

## How do I fix CVE-2026-33366?

No fix has been published for CVE-2026-33366 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33366 being exploited?

There is no known exploitation of CVE-2026-33366 in the wild and no public exploit code.

## Other vulnerabilities in BUFFALO Wi-Fi router products

- [CVE-2026-32669](https://insights.sbomify.com/CVE-2026-32669/): Code injection in BUFFALO Wi-Fi router products (high 8.7)
- [CVE-2026-32678](https://insights.sbomify.com/CVE-2026-32678/): Auth bypass in BUFFALO Wi-Fi router products (high 8.7)
- [CVE-2026-27650](https://insights.sbomify.com/CVE-2026-27650/): Command injection in BUFFALO Wi-Fi router products (high 8.6)
- [CVE-2026-33280](https://insights.sbomify.com/CVE-2026-33280/): Command injection in BUFFALO Wi-Fi router products (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33366 and fix it if it is affected.

What it is: CVE-2026-33366 is a medium-severity missing authorization vulnerability in BUFFALO Wi-Fi router products, published on 27 Mar 2026. 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-2026-33366 in the wild and no public exploit code.

Affected product: BUFFALO Wi-Fi router products. 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-2026-33366/ (Markdown: https://insights.sbomify.com/CVE-2026-33366/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33366
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33366
- OSV: https://osv.dev/vulnerability/CVE-2026-33366

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33366/
Summaries are generated and may contain mistakes; the official description above is the record.