CVE-2026-1143
TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow
- State
- Published
- Severity
- 8.7 High
- Published
- Jan 19, 2026
- Updated
- Feb 23, 2026
- Reserved
- Jan 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulDB |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R | VulDB |
| 3.0 | 8.8 High | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R | VulDB |
| 2.0 | 9.0 High | AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
A3700RTOTOLINK |
|
References
- VDB-341735 | TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflowvdb-entrytechnical-description
- VDB-341735 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- Submit #735502 | TOTOLINK A3700R V9.1.2u.5822_B20200513 Buffer Overflowthird-party-advisory
- https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setWiFiEasyGuestCfg-2e353a41781f8057a244ead07d5eaaff?source=copy_linkexploit
- https://www.totolink.net/product
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