Buffer Overflow Vulnerability in TOTOLINK A3700R Router
CVE-2026-1143

8.7HIGH

Key Information:

Vendor

Totolink
Status
A3700r
Vendor
CVE Published:
19 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-1143?

A vulnerability exists in the TOTOLINK A3700R router, specifically within the setWiFiEasyGuestCfg function located in the /cgi-bin/cstecgi.cgi file. By manipulating the 'ssid' argument, an attacker can trigger a buffer overflow, potentially leading to unauthorized remote execution of code. Publicly available exploits increase the risk of this vulnerability being exploited in the wild, necessitating prompt attention from users to secure their devices.

Affected Version(s)

A3700R 9.1.2u.5822_B20200513

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-2026-1143 - Proof of Concept

References

https://vuldb.com/?id.341735
vdb-entrytechnical-description
https://vuldb.com/?ctiid.341735
signaturepermissions-required
https://vuldb.com/?submit.735502
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)
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