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9.3

T-Mobile 5G Box IDU router lets attacker run commands via ping

CVE-2026-40855 · published 27 days ago
Summary

The T-Mobile 5G Box IDU router’s ping feature can be tricked into running any command the attacker supplies. An attacker who can log in could gain full control of the device. Upgrade the router to firmware version 1.1.0.651412 to fix the problem.

What to do
  • Update wnc t-mobile 5g box idu to version 1.1.0.651412 or later.
Affected software
VendorProductAffected versions
wnc t-mobile 5g box idu < 1.1.0.651412
Original advisory text
Command Injection in T-Mobile 5G Box IDU router via ping functionality
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
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.3 Critical
Exploitation
2% chance of attack within 30 days
Type
CWE-78OS Command Injection
Timeline
Published16 Sep 2026
Updated8 Oct 2026
First seen16 Sep 2026
Sources
CVE-2026-40855 · NVD
CVE-2026-40855 · MITRE
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