PLANET Technology Corp. PLANET GS-4210-16P2S up to 3.441b260625 CGI Handlers /cgi-bin/dispatcher.cgi POST parameters stack-based overflow

Summaryinfo

A vulnerability was found in PLANET Technology Corp. PLANET GS-4210-16P2S up to 3.441b260625. It has been classified as critical. Affected by this vulnerability is the function 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_acl_mgmt_Rules_Apply_post/web_acl_mgmt_Rules_Edit_post/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_dhcp_option82_post/web_dhcp_port_option82_cid_post of the file /cgi-bin/dispatcher.cgi of the component CGI Handlers. Performing a manipulation of the argument POST parameters results in stack-based overflow. This vulnerability is identified as CVE-2026-75126. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in PLANET Technology Corp. PLANET GS-4210-16P2S up to 3.441b260625. This affects the function 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_acl_mgmt_Rules_Apply_post/web_acl_mgmt_Rules_Edit_post/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_dhcp_option82_post/web_dhcp_port_option82_cid_post of the file /cgi-bin/dispatcher.cgi of the component CGI Handlers. The manipulation of the argument POST parameters with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as 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). This is going to have an impact on availability. The summary by CVE is:

PLANET GS-4210-16P2S 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.

It is possible to read the advisory at planet.com.tw. This vulnerability is uniquely identified as CVE-2026-75126 since 08/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.441b260626 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• PLANET Technology Corp.

Name

• PLANET GS-4210-16P2S

Version

• 3.441b260625

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion