Buffer Overflow Vulnerability in TOTOLINK CA300-PoE by TOTOLINK
CVE-2026-124059

9.4CRITICAL

Key Information:

Vendor

Totolink
Status
Ca300-poe
Vendor
CVE Published:
7 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-124059?

A security vulnerability has been identified in the TOTOLINK CA300-PoE device related to the function setWiFiWdsAddConfig located in /cgi-bin/cstecgi.cgi. This vulnerability arises from inadequate input validation in the ApCliKeyStr argument, enabling a potential buffer overflow exploit. This flaw allows remote attackers to execute malicious code and may compromise the device integrity. Publicly disclosed exploit techniques can be employed to target affected systems, necessitating prompt attention to ensure security measures are in place.

Affected Version(s)

CA300-PoE 6.2c.884

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-2026-124059 - Proof of Concept

References

https://vuldb.com/vuln/432114
vdb-entrytechnical-description
https://vuldb.com/vuln/432114/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-124059
third-party-advisory

CVSS V4

Score:
9.4
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

wxhwxhwxh_mie (VulDB User)
.