High severity · published Dec 24, 2025
CVE-2018-25143
Microhard Systems IPn4G 1.1.0 Backdoor Jailbreak via Microhard Sh Service
8.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MS
Microhard Systems 3G/4G Cellular Ethernet and Serial Gateway Backdoor Jailbreak · Microhard Systems
IPn4G 1.1.0 build 1098 · source: vendor
BF
Bullet-3g Firmware · Microhardcorp
1.2.0; 1.2.0 · source: NVD
BF
Bullet-lte Firmware · Microhardcorp
1.2.0 · source: NVD
BF
Bulletplus Firmware · Microhardcorp
1.3.0 · source: NVD
DF
Dragon-lte Firmware · Microhardcorp
1.1.0 · source: NVD
IF
Ipn3gb Firmware · Microhardcorp
2.2.0 · source: NVD
IF
Ipn3gii Firmware · Microhardcorp
1.2.0 · source: NVD
IF
Ipn4g Firmware · Microhardcorp
1.1.0 · source: NVD
IF
Ipn4gb Firmware · Microhardcorp
1.1.6; 1.1.0; 1.1.0 · source: NVD
IF
Ipn4gii Firmware · Microhardcorp
1.2.0 · source: NVD
VF
Vip4gb Firmware · Microhardcorp
1.1.6; 1.1.6 · source: NVD
VW
Vip4gb Wifi-n Firmware · Microhardcorp
1.1.6 · source: NVD
Affected product
MS
Microhard Systems 3G/4G Cellular Ethernet and Serial Gateway Backdoor Jailbreak
Microhard Systems