Buffer Overflow Vulnerability in TOTOLINK A702R Router
CVE-2025-9780

8.7HIGH

Key Information:

Vendor

Totolink
Status
A702r
Vendor
CVE Published:
1 September 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-9780?

A buffer overflow vulnerability has been identified in the TOTOLINK A702R router due to improper handling of input parameters in the function sub_419BE0 located in the /boafrm/formIpQoS file. This flaw allows an attacker to remotely send a crafted MAC address argument that can lead to arbitrary code execution. The exploit is publicly available, making it crucial for users of affected versions to take immediate precautionary measures to protect their networks.

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-2025-9780 - Proof of Concept

References

https://vuldb.com/?id.322082
vdb-entrytechnical-description
https://vuldb.com/?ctiid.322082
signaturepermissions-required
https://vuldb.com/?submit.640988
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)
.