TI-2025-03229 Aliases CVE-2025-3666 GHSA-pvmj-4jf2-h6jf

TOTOLINK A3700R cstecgi.cgi setDdnsCfg access control

HIGH 70CWE-266Published 2025-04-16 · Updated 2025-04-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Privilege escalation, Security bypass
Confidentiality · integrity · availability: None · Low · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-266 and CWE-284.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00637 50th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA and NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
TOTOLINK	A3700R	9.1.2u.5822_B20200513	—	No fix listed	CNA

A3700R VendorTOTOLINK Affected 9.1.2u.5822_B20200513 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:totolink:a3700r_firmware:9.1.2u.5822_b20200513:::::::*	9.1.2u.5822_b20200513	Vulnerable	TOTOLINK
cpe:2.3:h:totolink:a3700r:-:::::::*	not specified by NVD	Running on	TOTOLINK

cpe:2.3:o:totolink:a3700r_firmware:9.1.2u.5822_b20200513:*:*:*:*:*:*:* Versions 9.1.2u.5822_b20200513 Vulnerable ·TOTOLINK
cpe:2.3:h:totolink:a3700r:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TOTOLINK

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-3666
2026-10-03 Alias added: GHSA-pvmj-4jf2-h6jf
2026-10-25 EPSS moved to the 50th–90th percentile

References

Exploit 1

https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setDdnsCfg-1cb53a41781f8001b9c0f345a120e2e7?pvs=4

Other 1

https://www.totolink.net/

TI-2023-25090 An issue in TOTOLINK A3700R v.9.1.2u.6165_20211012 allows a remote attacker to execute… CVSS 3.1CRITICAL 9.8
TI-2024-28487 TOTOLINK A3700R v9.1.2u.5822_B20200513 has a buffer overflow vulnerability in the ssid… CVSS 3.1CRITICAL 9.8
TI-2024-25097 TOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via… CVSS 3.1CRITICAL 9.8
TI-2024-25096 TOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid… CVSS 3.1CRITICAL 9.8
TI-2024-25095 TOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid… CVSS 3.1CRITICAL 9.8
TI-2024-15102 TOTOLINK_A3700R_V9.1.2u.6165_20211012has a command Injection vulnerability via setOpModeCfg CVSS 3.1CRITICAL 9.8

See all 42 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences