How severe is CVE-2018-0666?

CVE-2018-0666 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-0666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-0666?

CVE-2018-0666 primarily affects Yamaha Rt57i Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-0666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-0666 published?

CVE-2018-0666 was published on 2019-01-09 and last updated on 2026-06-17.

CVE-2018-0666

CVE-2018-0666 is a medium-severity vulnerability in Yamaha Rt57i Firmware with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 5.2
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Yamaha Rt57i Firmware
Published: 2019-01-09
Last modified: 2026-06-17

Description

Yamaha routers RT57i Rev.8.00.95 and earlier, RT58i Rev.9.01.51 and earlier, NVR500 Rev.11.00.36 and earlier, RTX810 Rev.11.01.31 and earlier, allow an administrative user to embed arbitrary scripts to the configuration data through a certain form field of the configuration page, which may be executed on another administrative user's web browser. This is a different vulnerability from CVE-2018-0665.

Frequently asked questions

What is CVE-2018-0666?: Yamaha routers RT57i Rev.8.00.95 and earlier, RT58i Rev.9.01.51 and earlier, NVR500 Rev.11.00.36 and earlier, RTX810 Rev.11.01.31 and earlier, allow an administrative user to embed arbitrary scripts to the configuration data through a certain form field of the configuration page, which may be executed on another administrative user's web browser. This is a different vulnerability from CVE-2018-0665.
How severe is CVE-2018-0666?: CVE-2018-0666 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-0666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-0666?: CVE-2018-0666 primarily affects Yamaha Rt57i Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-0666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-0666 published?: CVE-2018-0666 was published on 2019-01-09 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:yamaha:rt57i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yamaha:rt58i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yamaha:nvr500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yamaha:rtx810_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Yamaha Rt57i Firmware

CVE-2018-0665 — Medium (CVSS 6.8): Yamaha routers RT57i Rev.8.00.95 and earlier, RT58i Rev.9.01.51 and earlier, NVR500 Rev.11.00.36 and earlier, RTX810…

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