Stack-Based Buffer Overflow in TOTOLINK EX200 Wireless Component
CVE-2026-114383

10CRITICAL

Key Information:

Vendor

Totolink
Status
Ex200
Vendor
CVE Published:
21 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-114383?

A vulnerability has been discovered in the TOTOLINK EX200 wireless router that allows for remote exploitation through a stack-based buffer overflow in the setWiFiAclAddConfig function. This issue arises from improper handling of the macAddress argument in the /cgi-bin/cstecgi.cgi file of the wireless.so component. If successfully exploited, this vulnerability can allow an attacker to execute arbitrary code or disrupt service, rendering the network vulnerable to various attacks. Users of the affected version are advised to take immediate precautions to secure their devices.

Affected Version(s)

EX200 5.2.3c.7200

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-2026-114383 - Proof of Concept

References

https://vuldb.com/vuln/424742
vdb-entrytechnical-description
https://vuldb.com/vuln/424742/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-114383
third-party-advisory

CVSS V4

Score:
10
Severity:
CRITICAL
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

zeroxf (VulDB User)
.