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CVE-2026-5339— Tenda G103 Setting gpon.lua action_set_net_settings command injection

Quick assessment

Affected
Tenda G103
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tenda G103是中国腾达（Tenda）公司的一个专为家庭、SOHO 用户设计的GPON 光纤接入设备。 Tenda G103 1.0.0.5版本存在命令注入漏洞，该漏洞源于组件Setting Handler的文件gpon.lua中函数action_set_net_settings对参数authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority的操作不当，可能导致命令注入。

CVSS 4.7 · Medium EPSS 10.21% · P96

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5339

Vulnerability Information
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Vulnerability Title
Tenda G103 Setting gpon.lua action_set_net_settings command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in Tenda G103 1.0.0.5. The impacted element is the function action_set_net_settings of the file gpon.lua of the component Setting Handler. Performing a manipulation of the argument authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority results in command injection. It is possible to initiate the attack remotely. The exploit is now public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda G103 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda G103是中国腾达（Tenda）公司的一个专为家庭、SOHO 用户设计的GPON 光纤接入设备。 Tenda G103 1.0.0.5版本存在命令注入漏洞，该漏洞源于组件Setting Handler的文件gpon.lua中函数action_set_net_settings对参数authLoid/authLoidPassword/authPassword/authSerialNo/authType/oltType/usVlanId/usVlanPriority的操作不当，可能导致命令注入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tenda G103 1.0.0.5 cpe:2.3:o:tenda:g103_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-5339

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III. Intelligence Information for CVE-2026-5339

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Proof of Concept for CVE-2026-5339 (1)

IV. Related Vulnerabilities

Same product: G103
Same vendor: Tenda
Same weakness: CWE-77

V. Comments for CVE-2026-5339

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