Buffer Overflow Vulnerability in TOTOLINK CA300-PoE Product
CVE-2026-124057

9.4CRITICAL

Key Information:

Vendor

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

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-124057?

A significant security flaw has been identified in the TOTOLINK CA300-PoE device affected by a buffer overflow in the setWiFiMultipleConfig function located within /cgi-bin/cstecgi.cgi. This vulnerability allows an attacker to manipulate the Key1Str1 argument, potentially leading to unauthorized access and remote code execution. The exploit is publicly available, heightening the risk of attacks targeting vulnerable installations of this product. Users are advised to review their systems and apply necessary mitigations.

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-2026-124057 - Proof of Concept

References

https://vuldb.com/vuln/432112
vdb-entrytechnical-description
https://vuldb.com/vuln/432112/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-124057
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)
.