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CVE-2026-40855

Command Injection in T-Mobile 5G Box IDU router via ping functionality

CVSS 4.0 9.3 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-40855

Published

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

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-40855

Published

T-Mobile 5G Box IDU

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "WNC",
                    "product": "T-Mobile 5G Box IDU",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThan": "1.1.0.651412",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON