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Vulnerability record · CVE-2025-3663 · published 16 April 2025

CVE-2025-3663: Totolink a3700r firmware improper access control vulnerability

TTotolink · A3700r Firmware

A vulnerability, which was classified as critical, has been found in TOTOLINK A3700R 9.1.2u.5822_B20200513. This issue affects the function setWiFiEasyCfg/setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi of the component Password Handler. The manipulation leads to improper access controls. The attack may be initiated 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.

6.9 CVSS 4.0 Medium EPSS 11% · top 4.2% CWE-266 · CWE-266CWE-284 · Improper access control
6.9CVSS 4.0 base score, v2 5.0
11%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, which was classified as critical, has been found in TOTOLINK A3700R 9.1.2u.5822_B20200513. This issue affects the function setWiFiEasyCfg/setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi of the component Password Handler. The manipulation leads to improper access controls. The attack may be initiated 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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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-setWiFiEasyCfg-1cb53a41781f809f807efe1284f5eb1a?pvs=4 ExploitThird Party Advisory
https://vuldb.com/?ctiid.304841 Permissions Required
https://vuldb.com/?id.304841 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.551295 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-2025-3663), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.