PLANET Technology PLANET GS-4210-16P2S up to 3.441b260625 Dispatcher /cgi-bin/dispatcher.cgi web_vlan_membership_edit_dialog_post memberTags os command injection

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k1.18

Summaryinfo

A vulnerability labeled as very critical has been found in PLANET Technology PLANET GS-4210-16P2S up to 3.441b260625. Affected is the function web_vlan_membership_edit_dialog_post of the file /cgi-bin/dispatcher.cgi of the component Dispatcher. Executing a manipulation of the argument memberTags can lead to os command injection. This vulnerability appears as CVE-2026-75121. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in PLANET Technology PLANET GS-4210-16P2S up to 3.441b260625 and classified as very critical. This vulnerability affects the function web_vlan_membership_edit_dialog_post of the file /cgi-bin/dispatcher.cgi of the component Dispatcher. The manipulation of the argument memberTags with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at planet.com.tw. This vulnerability was named CVE-2026-75121 since 08/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/28/2026). The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 3.441b260626 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.6
VulDB Meta Temp Score: 8.4

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.2
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Os command injection
CWE: CWE-78 / CWE-77 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: PLANET GS-4210-16P2S 3.441b260626

Timelineinfo

08/17/2026 CVE reserved
08/28/2026 +11 days Advisory disclosed
08/28/2026 +0 days VulDB entry created
08/28/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: planet.com.tw
Status: Confirmed

CVE: CVE-2026-75121 (🔒)
GCVE (CVE): GCVE-0-2026-75121
GCVE (VulDB): GCVE-100-396868

Entryinfo

Created: 08/28/2026 22:43
Changes: 08/28/2026 22:43 (78)
Complete: 🔍
Cache ID: 216::103

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