Buffer Overflow Vulnerability in TOTOLINK A702R HTTP Request Handler
CVE-2025-8139

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
Vendor
CVE Published:
25 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8139?

A buffer overflow vulnerability exists in the HTTP POST Request Handler of the TOTOLINK A702R, specifically related to the manipulation of the 'service_type' parameter in the /boafrm/formPortFw file. This flaw allows an attacker to exploit the system remotely, potentially compromising its integrity. The issue has been disclosed publicly, raising concerns about its exploitation in real-world scenarios.

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-2025-8139 - Proof of Concept

References

https://vuldb.com/?id.317535
vdb-entrytechnical-description
https://vuldb.com/?ctiid.317535
signaturepermissions-required
https://vuldb.com/?submit.620485
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-2025-8139 : Buffer Overflow Vulnerability in TOTOLINK A702R HTTP Request Handler