Stack-Based Buffer Overflow in Belkin F9K1122 Router Firmware
CVE-2025-7087

8.7HIGH

Key Information:

Vendor

Belkin

Status
F9k1122
Vendor
CVE Published:
6 July 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-7087?

A stack-based buffer overflow vulnerability exists in the Belkin F9K1122 router firmware version 1.00.33. The issue arises from improper handling of the L2TPUserName parameter in the formL2TPSetup function located in the /goform directory. An attacker can exploit this vulnerability remotely, potentially gaining unauthorized access to the system. The exploit has been made public, highlighting the urgent need for users to secure their devices. Despite early notification to the vendor, no response was received regarding this serious security flaw.

Affected Version(s)

F9K1122 1.00.33

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-2025-7087 - Proof of Concept

References

https://vuldb.com/?id.315001
vdb-entrytechnical-description
https://vuldb.com/?ctiid.315001
signaturepermissions-required
https://vuldb.com/?submit.603696
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

pjqwudi (VulDB User)
.
CVE-2025-7087 : Stack-Based Buffer Overflow in Belkin F9K1122 Router Firmware