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.

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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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