CVE-2018-25143 Microhard Systems IPn4G 1.1.0 Backdoor Jailbreak via Microhard Sh Service

High 8.7 Published 24 Dec 2025 Updated 24 Dec 2025

Authenticated attackers can escape a restricted shell via a custom ping command to execute arbitrary commands with root privileges on Microhard cellular gateways.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-25143?

CVE-2018-25143 is a high-severity command injection vulnerability in Microhard Systems 3G/4G Cellular Ethernet and Serial Gateway Backdoor Jailbreak, published on 24 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Microhard Systems IPn4G 1.1.0 contains a service vulnerability that allows authenticated users to enable a restricted SSH shell with a default 'msshc' user. Attackers can exploit a custom 'ping' command in the NcFTP environment to escape the restricted shell and execute commands with root privileges.

Weakness: CWE-78

Which versions are affected by CVE-2018-25143?

It affects 11 products.

Products include Microhardcorp Bullet-3g Firmware, Microhardcorp Bullet-Lte Firmware, Microhardcorp Bulletplus Firmware, Microhardcorp Dragon-Lte Firmware, Microhardcorp Ipn3gb Firmware, Microhardcorp Ipn3gii Firmware and 5 more.

How do I fix CVE-2018-25143?

No fix has been published for CVE-2018-25143 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2018-25143 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25143 exists.

Sources

Also known as GHSA-x8gg-ghxq-c254.