Vulnerability · Published Apr 16, 2025 · Assigned by VulDB

CVE-2025-3666TOTOLINK A3700R cstecgi.cgi setDdnsCfg access control

Medium 5.3

In plain English

A medium-severity improper access control in A3700R from TOTOLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.6%top 49.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
TOTOLINK	A3700R	9.1.2u.5822_B20200513

Weakness: CWE-284, CWE-266 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

VDB-304844 | TOTOLINK A3700R cstecgi.cgi setDdnsCfg access control vdb-entry, technical-description
VDB-304844 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #551298 | TOTOLINK A3700R V9.1.2u.5822_B20200513 Improper Access Controls third-party-advisory
https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setDdnsCfg-1cb53a41781f8001b9c0f345a120e2e7?pvs=4 exploit
https://www.totolink.net/ product