WNC T-Mobile 5G Box IDU prior 1.1.0.651412 Ping Functionality /cgi-bin/portal.cgi ping ping_ip/ping_size/ping_times command injection

Summaryinfo

A vulnerability classified as very critical was found in WNC T-Mobile 5G Box IDU. This issue affects the function ping of the file /cgi-bin/portal.cgi of the component Ping Functionality. Executing a manipulation of the argument ping_ip/ping_size/ping_times can lead to command injection. This vulnerability is handled as CVE-2026-40855. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in WNC T-Mobile 5G Box IDU and classified as very critical. This vulnerability affects the function ping of the file /cgi-bin/portal.cgi of the component Ping Functionality. The manipulation of the argument ping_ip/ping_size/ping_times with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

WNC T-Mobile 5G Box IDU router is vulnerable to a command injection. The vulnerability exists in the ping functionality within the /cgi-bin/portal.cgi endpoint, specifically affecting the ping_ip, ping_size, and ping_times POST parameters. The root cause is the failure to verify and sanitize user-supplied input before incorporating it into a system command. This allows an authenticated attacker to execute arbitrary commands on the shell and gain root access to the system.This issue has been fixed in firmware version 1.1.0.651412

The advisory is available at cert.pl. This vulnerability was named CVE-2026-40855 since 04/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/16/2026). This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 1.1.0.651412 eliminates this vulnerability.

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Vendor

• WNC

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• T-Mobile 5G Box IDU

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