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Vulnerability record · CVE-2026-4976 · published 27 March 2026

CVE-2026-4976: Totolink lr350 firmware memory buffer overflow vulnerability

TTotolink · Lr350 Firmware

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.

7.4 CVSS 4.0 High EPSS 1.0% · top 38.4% CWE-119 · Memory buffer overflowCWE-120 · Classic buffer overflow
7.4CVSS 4.0 base score, v2 9.0
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lavender-bicycle-a5a.notion.site/TOTOLINK-LR350-setWiFiGuestCfg-32153a41781f8048a918c1c78e95064e?source=copy_lin ExploitThird Party Advisory
https://vuldb.com/?ctiid.353863 Permissions RequiredVDB Entry
https://vuldb.com/?id.353863 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.778274 Third Party AdvisoryVDB Entry
https://www.totolink.net/ Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-42967Totolink lr350 firmware improper access control vulnerabilityIncorrect access control in TOTOLINK LR350 V9.3.5u.6369_B20220309 allows attackers to obtain the apmib configuration file, which contains the usernam…EPSS 0.60%9.8CVE-2024-36783Totolink lr350 firmware command injection vulnerabilityTOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection via the host_time parameter in the NTPSyncWithHost function.EPSS 1.4%9.8CVE-2024-35387Totolink lr350 firmware stack-based buffer overflow vulnerabilityTOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a stack overflow via the http_host parameter in the function loginAuth.EPSS 6.1%9.8CVE-2024-35099Totolink lr350 firmware classic buffer overflow vulnerabilityTOTOLINK LR350 V9.3.5u.6698_B20230810 was discovered to contain a stack overflow via the password parameter in the function loginAuth.EPSS 0.84%9.8CVE-2023-37145Totolink lr350 firmware command injection vulnerabilityTOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection vulnerability via the hostname parameter in the setOpModeCfg func…EPSS 2.0%9.8CVE-2023-37146Totolink lr350 firmware command injection vulnerabilityTOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection vulnerability via the FileName parameter in the UploadFirmwareFil…EPSS 2.0%9.8CVE-2023-37148Totolink lr350 firmware command injection vulnerabilityTOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection vulnerability via the ussd parameter in the setUssd function.EPSS 2.0%9.8CVE-2023-37149Totolink lr350 firmware command injection vulnerabilityTOTOLINK LR350 V9.3.5u.6369_B20220309 was discovered to contain a command injection vulnerability via the FileName parameter in the setUploadSetting …EPSS 2.0%

Source: NIST National Vulnerability Database (record CVE-2026-4976), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.