CVE-2026-5629
Received Received - Intake
Stack-Based Buffer Overflow in Belkin F9K1015 Firewall Function

Publication date: 2026-04-06

Last updated on: 2026-04-30

Assigner: VulDB

Description
A vulnerability was detected in Belkin F9K1015 1.00.10. The affected element is the function formSetFirewall of the file /goform/formSetFirewall. The manipulation of the argument webpage results in stack-based buffer overflow. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Meta Information
Published
2026-04-06
Last Modified
2026-04-30
Generated
2026-06-16
AI Q&A
2026-04-06
EPSS Evaluated
2026-06-14
NVD
CVE-2026-5629
EUVD
EUVD-2026-19182
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
belkin f9k1015_firmware 1.00.10
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

This vulnerability exists in the Belkin F9K1015 firmware version 1.00.10, specifically in the web interface function called formSetFirewall.

The issue arises because the function processes a user-supplied parameter named webpage and copies it into a stack-based buffer using the strcpy function without checking the length of the input.

This lack of bounds checking allows an attacker to send an excessively long webpage parameter in a POST request to /goform/formSetFirewall, causing a stack-based buffer overflow.

Exploiting this vulnerability can lead to denial of service (DoS) or remote code execution (RCE) on the affected device.

Impact Analysis

This vulnerability can have serious impacts including denial of service (DoS), which can make the device unavailable.

More critically, it can allow remote code execution (RCE), meaning an attacker could execute arbitrary code on the device remotely.

Such impacts can compromise the security and functionality of the affected Belkin F9K1015 device, potentially allowing attackers to take control or disrupt its operation.

Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests sent to the endpoint /goform/formSetFirewall with an unusually large payload in the parameter named webpage.

A practical detection method is to capture network traffic and filter for POST requests targeting /goform/formSetFirewall, then inspect the size of the webpage parameter.

  • Using tcpdump or Wireshark to capture HTTP POST requests to /goform/formSetFirewall.
  • Example tcpdump command: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/goform/formSetFirewall'
  • Using curl or similar tools to test by sending a POST request with a large webpage parameter and observing the device's response or behavior.
Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint /goform/formSetFirewall to trusted networks or IP addresses only.

If possible, disable remote management features on the affected Belkin F9K1015 device to prevent remote exploitation.

Monitor the device for unusual behavior or crashes that may indicate exploitation attempts.

Since the vendor has not responded, consider isolating the device from untrusted networks until a patch or firmware update is available.

Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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