CVE-2026-40855: 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 pingip, pingsize, and pingtimes 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
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WNC T-Mobile 5G Box IDU router firmwareto a version that resolves this vulnerability.Fixed in 1.1.0.651412
Event History
Frequently Asked Questions
What access does an attacker need to exploit this issue?
An attacker must be authenticated to the router. They can exploit the ping function by submitting crafted values in the ping_ip, ping_size, or ping_times POST parameters to /cgi-bin/portal.cgi.
What is the impact of successful exploitation?
Successful exploitation allows arbitrary shell command execution on the router. The attacker can gain root access to the system.
Which firmware version fixes the vulnerability?
The issue is fixed in firmware version 1.1.0.651412.