CVE-2025-3666

Name: CVE-2025-3666
Creator: NVD / NIST
Published: 2025-04-16T04:15:23.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2025-3666 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

CVSS 4.0

6.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.50%

38.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Totolink	A3700r Firmware	9.1.2u.5822_b20200513

References

https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setDdnsCfg-1cb53a41781f8001b9c0f345a120e2e7?pvs=4Exploit, Third Party Advisory
https://vuldb.com/?ctiid.304844Permissions Required
https://vuldb.com/?id.304844Third Party Advisory, VDB Entry
https://vuldb.com/?submit.551298Third Party Advisory, VDB Entry
https://www.totolink.net/Product

Timeline

Published: Apr 16, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-3666?

How severe is CVE-2025-3666?

CVE-2025-3666 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2025-3666?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-3666?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST