Tenda G300-F up to 16.01.14.2 Management Interface formSetWanDiag os command injection

Summaryinfo

A vulnerability has been found in Tenda G300-F up to 16.01.14.2 and classified as critical. This affects the function formSetWanDiag of the component Management Interface. Performing a manipulation results in os command injection. This vulnerability is reported as CVE-2026-25857. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in Tenda G300-F up to 16.01.14.2. This affects the function formSetWanDiag of the component Management Interface. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Tenda G300-F router firmware version 16.01.14.2 and prior contain an OS command injection vulnerability in the WAN diagnostic functionality (formSetWanDiag). The implementation constructs a shell command that invokes curl and incorporates attacker-controlled input into the command line without adequate neutralization. As a result, a remote attacker with access to the affected management interface can inject additional shell syntax and execute arbitrary commands on the device with the privileges of the management process.

The weakness was disclosed by evan. It is possible to read the advisory at blog.evan.lat. This vulnerability is uniquely identified as CVE-2026-25857 since 02/06/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/05/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-5714). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• Tenda

Name

• G300-F

Version

• 16.01.14.0
• 16.01.14.1
• 16.01.14.2

License

• commercial

Website

• Vendor: https://www.tenda.com.cn/

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

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