CVE-2021-47708 - CVE House

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Status published Critical CVE-2021-47708

COMMAX Smart Home IoT Control System SQL Injection Authentication Bypass

9.3 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

LiquidWorm as Gjoko Krstic of Zero Science Lab

References

More from COMMAX Co., Ltd.

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COMMAX Biometric Access Control System 1.0.0 Reflected XSS via Cookie Parameters

CNC_Ctrl DllUnregisterServer f5501 Access Violation

COMMAX Smart Home Ruvie CCTV Bridge DVR Service RTSP Credentials Disclosure

COMMAX Smart Home Ruvie CCTV Bridge DVR Service Config Write / DoS

COMMAX CVD-Axx DVR Weak Default Credentials Stream Disclosure

Affected Vendor

COMMAX Co., Ltd.

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Affected Software

Smart Home IoT Control System

Vulnerable Versions:

CDP-1020n, 481 System

Timeline

Official Publish: December 9th, 2025

Last Modified: July 15th, 2026

Added to House: July 21st, 2026

CVSS Vectors

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1059 Command and Scripting Interpreter

T1213.006 Databases

T1485 Data Destruction