Buffer Overflow Vulnerability in Totolink Router's WiFi Guest Configuration
CVE-2026-4976

8.7HIGH

Key Information:

Vendor

Totolink
Status
Lr350
Vendor
CVE Published:
27 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4976?

A vulnerability in the Totolink LR350 router allows for a buffer overflow through the 'setWiFiGuestCfg' function in the '/cgi-bin/cstecgi.cgi' file. By manipulating the 'ssid' argument, an attacker can exploit this flaw remotely. This public vulnerability presents a significant risk to users, as unauthorized access could lead to compromised network security.

Affected Version(s)

LR350 9.3.5u.6369_B20220309

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4976 - Proof of Concept

References

https://vuldb.com/?id.353863
vdb-entrytechnical-description
https://vuldb.com/?ctiid.353863
signaturepermissions-required
https://vuldb.com/?submit.778274
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

wxhwxhwxh_mie (VulDB User)
.