PT-2025-16555 · Totolink · Totolink A3700R

Yhryhryhr_Mie · Published 2025-04-15 · Updated 2025-04-16 · CVE-2025-3666

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions TOTOLINK A3700R version 9.1.2u.5822 B20200513

Description A critical issue was found in the setDdnsCfg function of the file /cgi-bin/cstecgi.cgi, leading 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.

Recommendations As a temporary workaround, consider disabling the setDdnsCfg function until a patch is available. Restrict access to the /cgi-bin/cstecgi.cgi file to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

RCE

Improper Access Control

Incorrect Privilege Assignment

Weakness Enumeration

CWE-284

CWE-266

Related Identifiers

BDU:2025-05800

CVE-2025-3666

Affected Products

Totolink A3700R

References · 11

• 🔥 https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setDdnsCfg-1cb53a41781f8001b9c0f345a120e2e7?pvs=4 · Exploit
• https://bdu.fstec.ru/vul/2025-05800 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-3666 · Security Note
• https://osv.dev/vulnerability/CVE-2025-3666 · Vendor Advisory
• https://vuldb.com/?submit.551298 · Note
• https://t.me/cvedetector/23043 · Telegram Post
• https://vuldb.com/?ctiid.304844 · Note
• https://totolink.net · Note
• https://vuldb.com/?id.304844 · Note
• https://t.me/cvetracker/21715 · Telegram Post
• https://twitter.com/CVEnew/status/1912359791797690485 · Twitter Post