CVE-2020-5548

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-04-01 12:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:21 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.4% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-04-01 12:15 UTC

Last modified

2026-06-17 03:21 UTC

Exploit probability

1.4% · EPSS, next 30 days

Record status

Modified

Affected

• Yamaha rtx830 Firmware ≤ 15.02.09
• Yamaha nvr510 Firmware ≤ 15.01.14
• Yamaha nvr700w Firmware ≤ 15.00.15
• Yamaha rtx1210 Firmware ≤ 14.01.33
• Yamaha rtx5000 Firmware ≤ 14.00.26
• Yamaha rtx3500 Firmware ≤ 14.00.26
• Yamaha fwx120 Firmware ≤ 11.03.27
• Yamaha rtx810 Firmware ≤ 11.01.33

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-5548.md and follow it. Check whether this project is affected by CVE-2020-5548. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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