Denial of Service Vulnerability in COMMAX Smart Home System
CVE-2021-47709

8.7HIGH

Key Information:

Vendor

Commax Co., Ltd.

Status
Smart Home Ruvie Cctv Bridge Dvr Service
Vendor
CVE Published:
9 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47709?

The COMMAX Smart Home System is vulnerable to an unauthenticated Denial of Service (DoS) attack through its setconf endpoint. An attacker can exploit this vulnerability by sending a malformed request, leading to configuration changes and ultimately causing service disruption. This poses significant risks in smart home environments where uninterrupted service is essential.

Affected Version(s)

Smart Home Ruvie CCTV Bridge DVR Service *

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47709 - Proof of Concept

References

https://www.exploit-db.com/exploits/50209
exploit
https://www.commax.com
product
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-56...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LiquidWorm as Gjoko Krstic of Zero Science Lab
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CVE-2021-47709 : Denial of Service Vulnerability in COMMAX Smart Home System