Stack-Based Buffer Overflow in Belkin Router Product
CVE-2026-5608

8.7HIGH

Key Information:

Vendor

Belkin

Status
F9k1122
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5608?

A flaw has been identified in the Belkin F9K1122 router version 1.00.33, where improper handling of the 'webpage' argument in the formWlanSetup function can lead to a stack-based buffer overflow. This vulnerability allows attackers to craft a malicious request that may potentially disrupt the device’s operation. The issue is particularly concerning as it can be exploited remotely, and the exploit has been made publicly available. Despite attempts to alert Belkin of this issue, there has been no response regarding remediation efforts. Users of the affected router should take immediate steps to mitigate potential risks.

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-2026-5608 - Proof of Concept

References

https://vuldb.com/vuln/355399
vdb-entrytechnical-description
https://vuldb.com/vuln/355399/cti
signaturepermissions-required
https://vuldb.com/submit/785315
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

LtzHust2 (VulDB User)
VulDB CNA Team
.