Vulnerability · Published Jan 19, 2026 · Assigned by VulDB
CVE-2026-1143TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow
High 8.8
In plain English
A high-severity buffer overflow in A3700R from TOTOLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 44.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-120, CWE-119 · Vector: 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
References
- VDB-341735 | TOTOLINK A3700R cstecgi.cgi setWiFiEasyGuestCfg buffer overflow vdb-entry, technical-description
- VDB-341735 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #735502 | TOTOLINK A3700R V9.1.2u.5822_B20200513 Buffer Overflow third-party-advisory
- https://lavender-bicycle-a5a.notion.site/TOTOLINK-A3700R-setWiFiEasyGuestCfg-2e353a41781f8057a244ead07d5eaaff?source=copy_link exploit
- https://www.totolink.net/ product