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CVE-2026-75121— PLANET GS-4210-16P2S Command Injection via dispatcher.cgi web_vlan_membership_edit_dialog_post

Quick assessment

Affected
PLANET Technology Corp. PLANET GS-4210-16P2S
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PLANET GS-4210-16P2S 在固件版本 3.441b260626 之前存在已认证的操作系统命令注入漏洞，位于 。其中 处理程序将 POST 参数未加过滤地直接拼接到 shell 命令中。远程已认证的攻击者可通过发送特制的 值，在设备上执行任意操作系统命令。

CVSS 7.2 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
PLANET Technology Corp. PLANET GS-4210-16P2S < 3.441b260626 affected
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I. Basic Information for CVE-2026-75121

Vulnerability Information
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Vulnerability Title
PLANET GS-4210-16P2S Command Injection via dispatcher.cgi web_vlan_membership_edit_dialog_post
Source: CVE Program / CVE List V5
Vulnerability Description
PLANET GS-4210-16P2S firmware before 3.441b260626 contains an authenticated OS command injection vulnerability in /cgi-bin/dispatcher.cgi. The web_vlan_membership_edit_dialog_post handler incorporates the memberTags POST parameter into a shell command without sanitization. A remote authenticated attacker can send a crafted memberTags value to execute arbitrary operating-system commands on the device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PLANET Technology Corp. PLANET GS-4210-16P2S 0 ~ 3.441b260626 -

II. Public POCs for CVE-2026-75121

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III. Intelligence Information for CVE-2026-75121

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Vendor Advisories for CVE-2026-75121 (2)

Same Patch Batch · PLANET Technology Corp. · 2026-08-28 · 8 CVEs total

CVE-2026-75124 7.5 HIGH PLANET GS-4210-16P2S Memory Corruption via dispatcher.cgi _readHttpParam
CVE-2026-75122 7.2 HIGH PLANET GS-4210-16P2S Command Injection via httpuploadcert.cgi
CVE-2026-75123 7.2 HIGH PLANET GS-4210-16P2S Command Injection via dispatcher.cgi web_smtp_test_post
CVE-2026-75126 4.9 MEDIUM PLANET GS-4210-16P2S Stack Buffer Overflow via dispatcher.cgi Standard Handlers
CVE-2026-75125 4.9 MEDIUM PLANET GS-4210-16P2S Null Pointer Dereference DoS via dispatcher.cgi web_poe_alive_rmtip_p
CVE-2026-77217 4.9 MEDIUM PLANET GS-4210-16P2S Stack Buffer Overflow and NULL Pointer Dereference via dispatcher.cgi
CVE-2026-77218 4.9 MEDIUM PLANET GS-4210-16P2S Stack Buffer Overflow via dispatcher.cgi Credential Handlers

IV. Related Vulnerabilities

Same product: PLANET GS-4210-16P2S
Same vendor: PLANET Technology Corp.
Same weakness: CWE-78

V. Comments for CVE-2026-75121

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