CVE-2021-47708 COMMAX Smart Home IoT Control System SQL Injection Authentication Bypass
Attackers can bypass authentication and gain unauthorized access to COMMAX Smart Home IoT Control Systems via SQL injection in the login parameter.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47708?
CVE-2021-47708 is a critical SQL injection vulnerability in COMMAX Co., Ltd. Smart Home IoT Control System, published on 9 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-89
Which versions are affected by CVE-2021-47708?
How do I fix CVE-2021-47708?
No fix has been published for CVE-2021-47708 yet. Limit exposure of the affected software until one is available.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2021-47708 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47708 exists.
Sources
Also known as GHSA-5j3x-hf29-3qgv.