CVE-2025-3666 - CVE House
Back to Database
Status published Medium CVE-2025-3666

TOTOLINK A3700R cstecgi.cgi setDdnsCfg access control

Vulnerability Description

A vulnerability was found in TOTOLINK A3700R 9.1.2u.5822_B20200513 and classified as critical. Affected by this issue is the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi. The manipulation leads to improper access controls. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2025-3666

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • yhryhryhr_mie (VulDB User)

References

More from TOTOLINK

View All →
CVE-2025-9935
TOTOLINK N600R cstecgi.cgi sub_4159F8 command injection
Medium 6.9
CVE-2025-9934
TOTOLINK X5000R cstecgi.cgi sub_410C34 command injection
Medium 5.3
CVE-2025-9783
TOTOLINK A702R formParentControl sub_418030 buffer overflow
High 8.7
CVE-2025-9782
TOTOLINK A702R formOneKeyAccessButton sub_4466F8 buffer overflow
High 8.7
CVE-2025-9781
TOTOLINK A702R formFilter sub_4162DC buffer overflow
High 8.7

Affected Vendor

Affected Software

A3700R
Vulnerable Versions:
9.1.2u.5822_B20200513

Timeline

Official Publish: April 16th, 2025
Last Modified: April 16th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weaknesses (CWE)

CWE-284 CWE-266

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1078 Valid Accounts
Persistence
T1213 Data from Information Repositories
Collection
T1565.002 Stored Data Manipulation
Impact
T1098 Account Manipulation
Privilege Escalation
T1548 Abuse Elevation Control Mechanism
Privilege Escalation
T1484 Domain or Tenant Policy Modification
Defense Evasion
T1021 Remote Services
Lateral Movement