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Vulnerability record · CVE-2026-1143 · published 19 January 2026

CVE-2026-1143: Totolink a3700r firmware memory buffer overflow vulnerability

TTotolink · A3700r Firmware

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.

7.4 CVSS 4.0 High EPSS 0.75% · top 47.1% CWE-119 · Memory buffer overflowCWE-120 · Classic buffer overflow
7.4CVSS 4.0 base score, v2 9.0
0.75%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 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.

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-A3700R-setWiFiEasyGuestCfg-2e353a41781f8057a244ead07d5eaaff?source=cop ExploitThird Party Advisory
https://vuldb.com/?ctiid.341735 Permissions RequiredVDB Entry
https://vuldb.com/?id.341735 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.735502 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-2024-42543Totolink a3700r firmware classic buffer overflow vulnerabilityTOTOLINK A3700R v9.1.2u.5822_B20200513 has a buffer overflow vulnerability in the http_host parameter in the loginauth function.EPSS 0.66%9.8CVE-2024-42545Totolink a3700r firmware classic buffer overflow vulnerabilityTOTOLINK A3700R v9.1.2u.5822_B20200513 has a buffer overflow vulnerability in the ssid parameter in setWizardCfg function.EPSS 0.66%9.8CVE-2024-37637Totolink a3700r firmware classic buffer overflow vulnerabilityTOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid5g in the function setWizardCfg.EPSS 0.67%9.8CVE-2024-37632Totolink a3700r firmware classic buffer overflow vulnerabilityTOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via the password parameter in function loginAuth .EPSS 0.64%9.8CVE-2024-37634Totolink a3700r firmware stack-based buffer overflow vulnerabilityTOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid in the function setWiFiEasyCfg.EPSS 0.67%9.8CVE-2024-37635Totolink a3700r firmware classic buffer overflow vulnerabilityTOTOLINK A3700R V9.1.2u.6165_20211012 was discovered to contain a stack overflow via ssid in the function setWiFiBasicCfgEPSS 0.66%9.8CVE-2024-22660Totolink a3700r firmware out-of-bounds write vulnerabilityTOTOLINK_A3700R_V9.1.2u.6165_20211012has a stack overflow vulnerability via setLanguageCfgEPSS 0.86%9.8CVE-2024-22662Totolink a3700r firmware out-of-bounds write vulnerabilityTOTOLINK A3700R_V9.1.2u.6165_20211012 has a stack overflow vulnerability via setParentalRulesEPSS 0.86%

Source: NIST National Vulnerability Database (record CVE-2026-1143), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.