Weak Default Administrative Credentials in COMMAX CVD-Axx DVR
CVE-2021-47707

9.3CRITICAL

Key Information:

Vendor

Commax Co., Ltd.

Status
Commax Cvd-axx Dvr
Vendor
CVE Published:
9 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47707?

COMMAX CVD-Axx DVR version 5.1.4 features weak default administrative credentials that could allow unauthorized users to perform remote password attacks. By sending a POST request with the passkey parameter set to '1234', attackers can gain access to the web control panel, potentially disclosing the RTSP stream. This vulnerability poses a significant risk to the integrity and security of the affected product, highlighting the importance of changing default credentials for enhanced security.

Affected Version(s)

COMMAX CVD-Axx DVR CVD-AH04 DVR 4.4.1

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-2021-47707 - Proof of Concept

References

https://www.exploit-db.com/exploits/50210
exploit
https://www.commax.com
product
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-56...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
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-2021-47707 : Weak Default Administrative Credentials in COMMAX CVD-Axx DVR