Buffer Overflow Vulnerability in TOTOLINK A3300R Router
CVE-2025-12240

8.7HIGH

Key Information:

Vendor

Totolink
Status
A3300r
Vendor
CVE Published:
27 October 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-12240?

A buffer overflow vulnerability exists in the TOTOLINK A3300R router within the setDmzCfg function located in /cgi-bin/cstecgi.cgi. The issue arises due to improper handling of the 'ip' argument, allowing an attacker to exploit this vulnerability remotely. If successfully executed, this may enable the attacker to execute arbitrary code on the device. Public disclosure of this exploit raises concerns regarding the security of systems using this specific firmware version.

Affected Version(s)

A3300R 17.0.0cu.557_B20221024

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-2025-12240 - Proof of Concept

References

https://vuldb.com/?id.329910
vdb-entrytechnical-description
https://vuldb.com/?ctiid.329910
signaturepermissions-required
https://vuldb.com/?submit.673722
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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