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.

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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
JSON
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