---
id: CVE-2026-75124
title: >-
  PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains a
  pre-authentication memory corruption vulnerability in the web management
  interface where the _readHttpParam function copies an oversized HTTP query
  string without guaranteei…
summary: >-
  PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains a
  pre-authentication memory corruption vulnerability in the web management
  interface where the _readHttpParam function copies an oversized HTTP query
  string without guaranteei…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-120
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:20:22.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75124'
references:
  - url: 'https://www.planet.com.tw/en/support/security-advisory/10'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/planet-gs-4210-16p2s-memory-corruption-via-dispatcher-cgi-readhttpparam
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00484
epssPercentile: 0.40858
ingestedAt: '2026-09-08T21:11:12.287Z'
---

## Overview

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains a pre-authentication memory corruption vulnerability in the web management interface where the _readHttpParam function copies an oversized HTTP query string without guaranteeing NUL termination, allowing parse_query_string to process attacker-controlled data into a fixed-size stack buffer. An unauthenticated remote attacker can send an oversized GET request to dispatcher.cgi to cause denial of service of the web management interface and potentially trigger memory corruption.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.