TI-2026-52784 Aliases CVE-2026-75126 GHSA-r4jg-62xg-rrfv

PLANET GS-4210-16P2S V3 Stack Buffer Overflow via dispatcher.cgi Standard Handlers

LOW 31CWE-121Published 2026-08-28 · Updated 2026-09-01

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

PLANET GS-4210-16P2S V3 firmware before 3.441b260626 contains multiple authenticated stack buffer overflow vulnerabilities in /cgi-bin/dispatcher.cgi. The following handlers copy attacker-controlled POST parameters into fixed-size stack buffers without length validation: web_vlan_membership_edit_dialog_post; web_dai_vlan_post; web_poe_alive_rmtip_post; web_sys_sntp_post; web_tool_upgradeManager_post; web_port_countersClr_post; web_rmon_statisticsClr_post; web_cablediag_copper_post; web_aaa_*Authlist* handlers; web_acl_mgmt_Rules_Apply_post; web_acl_mgmt_Rules_Edit_post; web_acl_*AceDel_post handlers; web_acl_*AceAdd/Edit_post handlers; web_acl_bindAdd_post; web_acl_bindEdit_post; web_snmp_v3view_add_post; web_snmp_v3group_add_post; web_snmp_v3community_add_post; web_snmp_v3host_add_post; web_snmp_notifyv3_add_post; web_snmp_v3user_add_post; web_snmpv3_remote_engineId_add_post; web_stp_globalSetting_post; web_isg_db_post; web_tacplus*_post handlers; web_dhcp_option82_post; and web_dhcp_port_option82_cid_post. A remote authenticated attacker can send crafted requests to crash the CGI process or web management service, resulting in denial of service.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00602 49th percentileScored 2026-11-07

Fix Fixed PLANET GS-4210-16P2S V3 (PLANET Technology Corp.): 3.441b260626

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
PLANET Technology Corp.	PLANET GS-4210-16P2S V3	before 3.441b260626	3.441b260626	Patch available	CNA

PLANET GS-4210-16P2S V3 VendorPLANET Technology Corp. Affected before 3.441b260626 Fixed in 3.441b260626 Patch available CNA

Remediation

Fix · CNA PLANET GS-4210-16P2S V3 (PLANET Technology Corp.) Fixed in 3.441b260626

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-08-28
PLANET GS-4210-16P2S V3 — planet.com.tw/en/support/security-advisory/10
8 records Highest priority Priority MEDIUM 4 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2026-52782 PLANET GS-4210-16P2S V3 Memory Corruption via dispatcher.cgi _readHttpParamPriority MEDIUM 45
- TI-2026-52781 PLANET GS-4210-16P2S V3 Command Injection via dispatcher.cgi web_smtp_test_postPriority MEDIUM 42
- TI-2026-52779 PLANET GS-4210-16P2S V3 Command Injection via dispatcher.cgi web_vlan_membership_edit_dialog_postPriority MEDIUM 42
Show all 8 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-75126
2026-10-03 Alias added: GHSA-r4jg-62xg-rrfv

References

Patch 1

Vendor Advisory

TI-2024-34993 Planet Technology Planet WGS-804HPT Command Injection CVSS 4.0CRITICAL 9.3
TI-2025-29023 Planet Technology Network Products OS Command Injection CVSS 4.0CRITICAL 9.3
TI-2025-09152 Planet Technology｜Industrial Cellular Gateway - OS Command Injection CVSS 4.0CRITICAL 9.3
TI-2025-29024 Planet Technology Network Products OS Command Injection CVSS 4.0CRITICAL 9.3
TI-2024-32571 Planet Technology Planet WGS-804HPT Stack-based Buffer Overflow CVSS 4.0CRITICAL 9.3
TI-2024-07838 PLANET Technology switch devices - Missing Authentication for multiple HTTP routes CVSS 3.1CRITICAL 9.8

See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences