Vulnerability · Published Mar 27, 2026 · Assigned by VulDB
CVE-2026-4976Totolink LR350 cstecgi.cgi setWiFiGuestCfg buffer overflow
High 8.8
In plain English
A high-severity buffer overflow in LR350 from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 48.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
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-353863 | Totolink LR350 cstecgi.cgi setWiFiGuestCfg buffer overflow vdb-entry, technical-description
- VDB-353863 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
- Submit #778274 | TOTOLINK LR350 LR350 V9.3.5u.6369_B20220309 Buffer Overflow third-party-advisory
- https://lavender-bicycle-a5a.notion.site/TOTOLINK-LR350-setWiFiGuestCfg-32153a41781f8048a918c1c78e95064e?source=copy_link exploit
- https://www.totolink.net/ product