Improper Access Controls in TOTOLINK A3700R Router
CVE-2025-3666

6.9MEDIUM

Key Information:

Vendor
Totolink
Status
A3700r
Vendor
CVE Published:
16 April 2025

Badges

👾 Exploit Exists🟡 Public PoC

Summary

A critical vulnerability exists in the TOTOLINK A3700R router, primarily affecting the setDdnsCfg function within the /cgi-bin/cstecgi.cgi file. This flaw allows remote attackers to exploit improper access controls, potentially leading to unauthorized actions on the device. The security issue has been made public, raising serious concerns for users. Despite efforts to notify the vendor prior to the public disclosure, no response has been received, leaving the vulnerability unaddressed.

Affected Version(s)

A3700R 9.1.2u.5822_B20200513

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-2025-3666 - Proof of Concept

References

https://vuldb.com/?id.304844
vdb-entrytechnical-description
https://vuldb.com/?ctiid.304844
signaturepermissions-required
https://vuldb.com/?submit.551298
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
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

yhryhryhr_mie (VulDB User)
.