Buffer Overflow Vulnerability in TOTOLINK A702R HTTP POST Request Handler
CVE-2025-6940

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
Vendor
CVE Published:
1 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6940?

A buffer overflow vulnerability has been identified in the TOTOLINK A702R when handling HTTP POST requests through the /boafrm/formParentControl component. The vulnerability arises from improper processing of the 'submit-url' parameter, which can be exploited remotely. Attackers may manipulate this parameter to cause a buffer overflow, potentially compromising the device's functionality and allowing unauthorized access or control. Given the public disclosure of this exploit, it is crucial for users to implement appropriate security measures and updates to safeguard their systems.

Affected Version(s)

A702R 4.0.0-B20230721.1521

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-2025-6940 - Proof of Concept

References

https://vuldb.com/?id.314461
vdb-entrytechnical-description
https://vuldb.com/?ctiid.314461
signaturepermissions-required
https://vuldb.com/?submit.605861
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

Ye Leipeng (VulDB User)
.
CVE-2025-6940 : Buffer Overflow Vulnerability in TOTOLINK A702R HTTP POST Request Handler