Stack-based Buffer Overflow in Belkin F9K1015 Router
CVE-2026-5611

8.7HIGH

Key Information:

Vendor

Belkin

Status
F9k1015
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5611?

A stack-based buffer overflow vulnerability has been identified in the Belkin F9K1015 router, specifically within the formCrossBandSwitch function located in the /goform/formCrossBandSwitch file. This vulnerability arises from improper argument handling within the web interface, allowing an attacker to craft a malicious request that exploits the overflow. The exploit can be initiated remotely, and it poses a significant risk as the details have already been made public. Despite early notifications sent to the vendor regarding this issue, there has been no response.

Affected Version(s)

F9K1015 1.00.10

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-2026-5611 - Proof of Concept

References

https://vuldb.com/vuln/355402
vdb-entrytechnical-description
https://vuldb.com/vuln/355402/cti
signaturepermissions-required
https://vuldb.com/submit/785538
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

LtzHust (VulDB User)
VulDB CNA Team
.