Buffer Overflow in TOTOLINK A702R HTTP POST Request Handler
CVE-2025-8138

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
Vendor
CVE Published:
25 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8138?

The TOTOLINK A702R contains a vulnerability in the HTTP POST request handler, specifically within the formOneKeyAccessButton component. By manipulating the 'submit-url' argument, an attacker may trigger a buffer overflow condition. This can be exploited remotely, posing a significant risk to device integrity and security. Public disclosure of this exploit increases the urgency for users to patch or mitigate the vulnerability.

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-2025-8138 - Proof of Concept

References

https://vuldb.com/?id.317534
vdb-entrytechnical-description
https://vuldb.com/?ctiid.317534
signaturepermissions-required
https://vuldb.com/?submit.620484
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

panda_0x1 (VulDB User)
.
CVE-2025-8138 : Buffer Overflow in TOTOLINK A702R HTTP POST Request Handler