CVE-2020-5548: Yamaha LTE VoIP Router(NVR700W firmware Rev.15.00.15 and earlier), Yamaha Gigabit VoIP Router(NVR510 firmware
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HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE
CVE-2020-5548 is a high-severity flaw (CVSS 7.5) affecting rtx830 firmware, nvr510 firmware, nvr700w firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 Rout
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
yamaha rtx830 firmware UPGRADE
Affected: <= 15.02.09
Fixed in: newer than 15.02.09
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
yamaha nvr510 firmware UPGRADE
Affected: <= 15.01.14
Fixed in: newer than 15.01.14
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
yamaha nvr700w firmware UPGRADE
Affected: <= 15.00.15
Fixed in: newer than 15.00.15
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
yamaha rtx1210 firmware UPGRADE
Affected: <= 14.01.33
Fixed in: newer than 14.01.33
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
yamaha rtx5000 firmware UPGRADE
Affected: <= 14.00.26
Fixed in: newer than 14.00.26
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
yamaha rtx3500 firmware UPGRADE
Affected: <= 14.00.26
Fixed in: newer than 14.00.26
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-5548?
rtx830 firmware: upgrade to newer than 15.02.09; nvr510 firmware: upgrade to newer than 15.01.14; nvr700w firmware: upgrade to newer than 15.00.15. Exact commands for each OS are on this page.
Is CVE-2020-5548 being exploited?
CVE-2020-5548 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-5548 affect?
CVE-2020-5548 affects rtx830 firmware, nvr510 firmware, nvr700w firmware. Severity is high (CVSS 7.5). 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 ea
How urgent is CVE-2020-5548?
Priority 49/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
CVE-2021-20844MEDIUM 5.7UPGRADEUPGRADE Improper neutralization of HTTP request headers for scripting syntax vulnerability in the Web GUI of RTX830 Re
CVE-2021-20843MEDIUM 5.4UPGRADEUPGRADE Cross-site script inclusion vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR510 Rev.15.01.
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