# CVE-2020-5548: Denial of service in Yamaha network devices

> Remote attackers can cause a denial of service on Yamaha routers and firewalls via unspecified vectors.

- **Severity:** High 7.5 (`CVSS:3.1/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:** 1 Apr 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-4f29-4fj4-943j

## What is CVE-2020-5548?

CVE-2020-5548 is a high-severity denial of service vulnerability in Yamaha network devices, published on 1 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Yamaha LTE VoIP Router(NVR700W firmware Rev.15.00.15 and earlier), Yamaha Gigabit VoIP Router(NVR510 firmware Rev.15.01.14 and earlier), Yamaha Gigabit VPN Router(RTX810 firmware Rev.11.01.33 and earlier, RTX830 firmware Rev.15.02.09 and earlier, RTX1200 firmware Rev.10.01.76 and earlier, RTX1210 firmware Rev.14.01.33 and earlier, RTX3500 firmware Rev.14.00.26 and earlier, and RTX5000 firmware Rev.14.00.26 and earlier), Yamaha Broadband VoIP Router(NVR500 firmware Rev.11.00.38 and earlier), and Yamaha Firewall(FWX120 firmware Rev.11.03.27 and earlier) allow remote attackers to cause a denial of service via unspecified vectors.

## Which versions are affected by CVE-2020-5548?

It affects 10 products.


Products: Yamaha Fwx120 Firmware, Yamaha Nvr500 Firmware, Yamaha Nvr510 Firmware, Yamaha Nvr700w Firmware, Yamaha Rtx1200 Firmware, Yamaha Rtx1210 Firmware, Yamaha Rtx3500 Firmware, Yamaha Rtx5000 Firmware, Yamaha Rtx810 Firmware, Yamaha Rtx830 Firmware.

## How do I fix CVE-2020-5548?

No fix has been published for CVE-2020-5548 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-5548 being exploited?

There is no known exploitation of CVE-2020-5548 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-5548 and fix it if it is affected.

What it is: CVE-2020-5548 is a high-severity denial of service vulnerability in Yamaha network devices, published on 1 Apr 2020. 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-2020-5548 in the wild and no public exploit code.

Affected product: Yamaha 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-2020-5548/ (Markdown: https://insights.sbomify.com/CVE-2020-5548/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-5548
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-5548
- OSV: https://osv.dev/vulnerability/CVE-2020-5548

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-5548/
Summaries are generated and may contain mistakes; the official description above is the record.