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CVE-2018-0666

23
FAUCET Score

CVE-2018-0666 is a stored cross-site scripting (XSS) vulnerability affecting several Yamaha router models, including the RT57i, RT58i, NVR500, and RTX810, in specific firmware versions. An authenticated administrative user can inject malicious scripts into the configuration data via a form field, which then executes in another administrator's web browser. This vulnerability has a CVSS v3 score of 6.8 (Medium), indicating a high impact on confidentiality, integrity, and availability, with an adjacent attack vector and high privileges required. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= rev.8.00.95CPE matchmatch criteria
cpe:2.3:o:yamaha:rt57i_firmware:*:*:*:*:*:*:*:*
<= rev.9.01.51CPE matchmatch criteria
cpe:2.3:o:yamaha:rt58i_firmware:*:*:*:*:*:*:*:*
<= rev.11.00.36CPE matchmatch criteria
cpe:2.3:o:yamaha:nvr500_firmware:*:*:*:*:*:*:*:*
<= rev.11.01.31CPE matchmatch criteria
cpe:2.3:o:yamaha:rtx810_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.8MEDIUM

CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.65%
Probability of exploitation in next 30 days
EPSS Percentile
47.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0065 is in the 57th percentile among its peer group of 399 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

flets-w.com / solution/kiki_info/info/180829.html
Third Party Advisory
jvn.jp / en/jp/JVN69967692/index.html
Third Party Advisory
web116.jp / ced/support/news/contents/2018/20180829b.html
Third Party Advisory
rtpro.yamaha.co.jp / RT/FAQ/Security/JVN69967692.html
Third Party Advisory