Buffer Overflow in TOTOLINK A702R Affects Remote HTTP POST Handler
CVE-2025-8136

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
Vendor
CVE Published:
25 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8136?

A buffer overflow vulnerability exists in the TOTOLINK A702R router, specifically within the HTTP POST Request Handler component. This issue arises from improper handling of the 'ip6addr' argument, allowing remote attackers to exploit the vulnerability and potentially execute arbitrary code. The impact is significant as it can be exploited without physical access to the device, presenting a serious security risk to affected systems. Users are encouraged to apply necessary security measures to mitigate exposure.

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-2025-8136 - Proof of Concept

References

https://vuldb.com/?id.317532
vdb-entrytechnical-description
https://vuldb.com/?ctiid.317532
signaturepermissions-required
https://vuldb.com/?submit.620482
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-2025-8136 : Buffer Overflow in TOTOLINK A702R Affects Remote HTTP POST Handler