CVE-2025-25220 Overview
CVE-2025-25220 is an OS command injection vulnerability affecting +F FS010M mobile router devices prior to firmware version V2.0.1_1101. The flaw stems from improper neutralization of special elements used in operating system commands [CWE-78]. A remote authenticated attacker can leverage the weakness to execute arbitrary OS commands on the affected device. Successful exploitation grants attacker control over the router's underlying operating system, exposing connected network traffic to interception and manipulation.
Critical Impact
Authenticated attackers can execute arbitrary OS commands on +F FS010M routers, gaining full control of the device and the network segments it serves.
Affected Products
- +F FS010M firmware versions prior to V2.0.1_1101
- FSI PlusF mobile router product line
- Devices managed through the vendor's administrative web interface
Discovery Timeline
- 2025-03-18 - CVE-2025-25220 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-25220
Vulnerability Analysis
The vulnerability resides in the +F FS010M firmware, where user-supplied input is passed to operating system command interpreters without adequate sanitization. An attacker authenticated to the device's management interface can inject shell metacharacters into a vulnerable parameter. The injected payload is then concatenated into a command string and executed by the underlying OS shell.
Because the router runs management processes with elevated privileges, the executed commands inherit those privileges. Attackers can use this access to modify network configuration, intercept traffic, pivot to internal hosts, or install persistent backdoors. The attack requires only network reachability to the management interface and valid credentials, which lowers the effective bar when default or weak credentials remain in use.
Root Cause
The root cause is improper neutralization of special elements in OS command construction [CWE-78]. Input received from authenticated sessions is incorporated into shell command strings without escaping, quoting, or argument-array separation. Shell metacharacters such as ;, |, &, and backticks allow attackers to terminate the intended command and append arbitrary commands.
Attack Vector
Exploitation requires network access to the device management interface and valid authentication credentials. The attacker submits crafted parameter values containing command separators followed by an attacker-controlled command. The firmware passes the concatenated string to the OS shell, which executes both the intended and injected commands. Technical specifics are documented in the JVN Security Advisory JVN11230428 and the FSI PlusF News Update.
Detection Methods for CVE-2025-25220
Indicators of Compromise
- Unexpected outbound connections originating from the router's management plane to unknown external hosts
- Configuration changes to DNS, routing, or firewall rules that were not initiated by administrators
- New or modified accounts on the device, or unusual login activity from administrative interfaces
- Anomalous processes or persistent services observed in vendor diagnostic logs
Detection Strategies
- Inspect HTTP/HTTPS requests to the device management interface for shell metacharacters such as ;, |, &, $(), and backticks in parameter values
- Correlate authenticated administrative sessions with unusual outbound traffic patterns from the router itself
- Monitor for firmware integrity changes and unauthorized configuration modifications
Monitoring Recommendations
- Forward router syslog and authentication logs to a centralized log analytics platform for retention and review
- Alert on repeated failed logins followed by successful authentication to administrative endpoints
- Track changes to administrative credentials and management interface accessibility from non-trusted networks
How to Mitigate CVE-2025-25220
Immediate Actions Required
- Upgrade +F FS010M firmware to version V2.0.1_1101 or later as released by the vendor
- Rotate all administrative credentials on affected devices and remove unused accounts
- Restrict management interface exposure to trusted internal networks only
- Review device configuration and logs for evidence of unauthorized command execution
Patch Information
The vendor has released firmware version V2.0.1_1101 that addresses CVE-2025-25220. Refer to the FSI PlusF News Update for official upgrade instructions and the JVN Security Advisory JVN11230428 for coordinated disclosure details.
Workarounds
- Block access to the device's web management interface from untrusted network segments using upstream firewall rules
- Enforce strong, unique administrative passwords and disable remote management where not required
- Place affected routers behind a network segmentation boundary until firmware updates are applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
