Buffer Overflow Vulnerability in TOTOLINK A702R Router
CVE-2025-9783

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
Vendor
CVE Published:
1 September 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-9783?

A buffer overflow vulnerability exists in the TOTOLINK A702R router, specifically in the sub_418030 function of the /boafrm/formParentControl file. By manipulating the 'submit-url' argument, an attacker could potentially cause a buffer overflow, enabling remote execution of malicious code. This vulnerability has been disclosed to the public, posing a significant risk to users operating the affected version. It is crucial to implement protective measures to safeguard against possible exploitation.

Affected Version(s)

A702R 4.0.0-B20211108.1423

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-2025-9783 - Proof of Concept

References

https://vuldb.com/?id.322085
vdb-entrytechnical-description
https://vuldb.com/?ctiid.322085
signaturepermissions-required
https://vuldb.com/?submit.640991
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

rew1X (VulDB User)
.