Buffer Overflow Vulnerability in TOTOLINK A702R HTTP POST Request Handler
CVE-2025-8140

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
Vendor
CVE Published:
25 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8140?

A buffer overflow vulnerability has been identified in the TOTOLINK A702R router, specifically within the HTTP POST Request Handler located in the /boafrm/formWlanMultipleAP file. This flaw allows an attacker to manipulate the submit-url argument, potentially enabling remote exploitation. The vulnerability poses significant security risks as it may facilitate unauthorized access or control of affected devices. As public knowledge of the exploit has been disclosed, users are strongly advised to take immediate action to mitigate any associated risks.

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-2025-8140 - Proof of Concept

References

https://vuldb.com/?id.317536
vdb-entrytechnical-description
https://vuldb.com/?ctiid.317536
signaturepermissions-required
https://vuldb.com/?submit.620486
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-2025-8140 : Buffer Overflow Vulnerability in TOTOLINK A702R HTTP POST Request Handler