TI-2026-04337 Aliases CVE-2026-4976 GHSA-h682-387f-gvmv

Totolink LR350 cstecgi.cgi setWiFiGuestCfg buffer overflow

HIGH 73CWE-119Published 2026-03-27 · Updated 2026-03-30

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 vulnerability was found in Totolink LR350 9.3.5u.6369_B20220309. This vulnerability affects the function setWiFiGuestCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ssid results in buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00666 52nd 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	LR350	9.3.5u.6369_B20220309	—	No fix listed	CNA

LR350 VendorTOTOLINK Affected 9.3.5u.6369_B20220309 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:totolink:lr350_firmware:9.3.5u.6369_b20220309:::::::*	9.3.5u.6369_b20220309	Vulnerable	TOTOLINK
cpe:2.3:h:totolink:lr350:-:::::::*	not specified by NVD	Running on	TOTOLINK

cpe:2.3:o:totolink:lr350_firmware:9.3.5u.6369_b20220309:*:*:*:*:*:*:* Versions 9.3.5u.6369_b20220309 Vulnerable ·TOTOLINK
cpe:2.3:h:totolink:lr350:-:*:*:*:*:*:*:* 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-2026-4976
2026-10-03 Alias added: GHSA-h682-387f-gvmv

References

Exploit 1

https://lavender-bicycle-a5a.notion.site/TOTOLINK-LR350-setWiFiGuestCfg-32153a41781f8048a918c1c78e95064e?source=copy_link

Other 1

https://www.totolink.net/

TI-2024-28696 Incorrect access control in TOTOLINK LR350 V9.3.5u.6369_B20220309 allows attackers to… CVSS 3.1CRITICAL 9.8
TI-2024-23410 TOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a stack overflow via the… CVSS 3.1CRITICAL 9.8
TI-2023-18806 TOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
TI-2023-18805 TOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
TI-2023-18804 TOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8
TI-2023-18803 TOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection… CVSS 3.1CRITICAL 9.8

See all 35 →

Sources

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