TI-2026-00871 Aliases CVE-2026-1143 GHSA-m237-23r2-f38w

TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow

HIGH 73CWE-119Published 2026-01-19 · Updated 2026-02-23

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

A weakness has been identified in TOTOLINK A3700R 9.1.2u.5822_B20200513. This affects the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument ssid can lead to buffer overflow. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00762 55th 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: No
Technical impact: Total

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-2026-1143
2026-10-03 Alias added: GHSA-m237-23r2-f38w

References

Exploit 1

https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setWiFiEasyGuestCfg-2e353a41781f8057a244ead07d5eaaff?source=copy_link

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