CVE-2021-47708
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-09

Last updated on: 2025-12-09

Assigner: VulnCheck

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.
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Meta Information
Published
2025-12-09
Last Modified
2025-12-09
Generated
2026-06-16
AI Q&A
2025-12-09
EPSS Evaluated
2026-06-15
NVD
CVE-2021-47708
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
commax smart_home_system 4.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-89 The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.
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Executive Summary

This vulnerability is an SQL injection in the COMMAX Smart Home System CDP-1020n. It allows attackers to bypass authentication by injecting malicious SQL code through the 'id' parameter in the 'loginstart.asp' page. By sending a specially crafted POST request with malicious 'id' values, attackers can manipulate database queries to gain unauthorized access.

Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests to the 'loginstart.asp' endpoint containing SQL injection payloads in the 'id' parameter. For example, sending crafted POST requests with payloads such as `id=' or 1=1--` can test for the vulnerability. Network intrusion detection systems (NIDS) can be configured to alert on such SQL injection patterns targeting the 'loginstart.asp' script. Additionally, manual testing using tools like curl or Burp Suite to send POST requests with malicious 'id' values can help detect the vulnerability. [2, 3, 4]

Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable 'loginstart.asp' endpoint, applying input validation and sanitization on the 'id' parameter to prevent SQL injection, and updating or patching the COMMAX Smart Home System CDP-1020n firmware or software if a fix is available. If patches are not yet available, consider implementing network-level protections such as web application firewalls (WAF) to block malicious SQL injection attempts. Monitoring logs for suspicious activity and changing any potentially compromised credentials is also recommended. [2, 4]

Impact Analysis

The vulnerability can allow attackers to bypass authentication and gain unauthorized access to the COMMAX Smart Home System. This unauthorized access could lead to control over smart home devices, exposure of sensitive information, and potential further exploitation of the system.

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