CVE-2025-3666 — MEDIUM (5.3)

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.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Totolink	A3700R Firmware	9.1.2u.5822_b20200513
Totolink	A3700R	-

Related Weaknesses (CWE)

CWE-266 CWE-284

References

https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setDdnsCfg-1cb53a41781fExploitThird Party Advisory
https://vuldb.com/?ctiid.304844Permissions Required
https://vuldb.com/?id.304844Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.551298Third Party AdvisoryVDB Entry
https://www.totolink.net/Product

FAQ

What is CVE-2025-3666?

CVE-2025-3666 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 lead...

How severe is CVE-2025-3666?

CVE-2025-3666 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-3666?

Check the references section above for vendor advisories and patch information. Affected products include: Totolink A3700R Firmware, Totolink A3700R.