CVE-2025-24306 Overview
CVE-2025-24306 is an OS command injection vulnerability affecting the +F FS010M mobile router from FSI PlusF. The flaw exists in firmware versions prior to V2.0.0_1101 and is classified under [CWE-78] Improper Neutralization of Special Elements used in an OS Command. A remote authenticated attacker with administrative privileges can execute arbitrary operating system commands on the device. The vulnerability carries a CVSS 3.0 base score of 7.2 and is rated HIGH severity.
Critical Impact
Successful exploitation grants attackers arbitrary OS command execution on the router with the privileges of the underlying service, enabling full device compromise, traffic interception, and pivoting into connected networks.
Affected Products
- FSI PlusF +F FS010M mobile router
- Firmware versions prior to V2.0.0_1101
- Devices using the default web administration interface
Discovery Timeline
- 2025-03-18 - CVE-2025-24306 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-24306
Vulnerability Analysis
The +F FS010M is a portable LTE mobile router distributed in Japan. The vulnerability resides in an administrative interface handler that constructs operating system commands using attacker-controlled input without proper sanitization. Because special shell metacharacters are not neutralized, an authenticated administrator can inject additional commands that the device executes through its underlying shell.
The issue maps to [CWE-78], a class of flaws where untrusted input flows into a command interpreter such as system(), popen(), or exec() calls. Exploitation typically yields code execution as the service user, often root on embedded Linux routers. Vendor advisories from FSI PlusF and JVN confirm that firmware V2.0.0_1101 corrects the input handling.
Root Cause
The firmware concatenates user-supplied parameters directly into shell command strings invoked from the management web application. Without escaping or allow-listing, characters such as ;, |, &, and backticks break out of the intended command context. The fix introduces input validation and removes the unsafe shell invocation path.
Attack Vector
The attack requires network reachability to the router's management interface and valid administrative credentials. An attacker who has obtained admin access through credential theft, default credentials, or CSRF chaining submits a crafted request to a vulnerable management endpoint. The injected payload executes alongside the legitimate command, returning output or establishing persistent access such as a reverse shell. The vulnerability does not require user interaction once authenticated.
No public proof-of-concept exploit code is available in Exploit-DB or CISA KEV at the time of publication. Refer to the JVN Security Advisory JVN11230428 for vendor-confirmed technical context.
Detection Methods for CVE-2025-24306
Indicators of Compromise
- Unexpected outbound connections originating from the router's management IP to unknown hosts
- Configuration changes, new administrative users, or modified DNS settings on the device
- Anomalous shell processes or persistence artifacts in router logs where available
- Unusual HTTP POST requests to administrative endpoints containing shell metacharacters such as ;, |, &, or $()
Detection Strategies
- Inspect HTTP traffic to the router's management interface for parameters containing shell metacharacters or encoded variants
- Correlate administrative login events with subsequent configuration changes and outbound connections
- Monitor for repeated authentication attempts that precede command injection probes
- Compare firmware version strings reported by managed devices against the patched baseline V2.0.0_1101
Monitoring Recommendations
- Centralize router and gateway logs into a SIEM or data lake for correlation with endpoint telemetry
- Alert on administrative interface access from IP addresses outside approved management networks
- Track DNS and routing configuration drift on edge devices using configuration management baselines
- Review NetFlow or equivalent telemetry for lateral movement patterns originating from network infrastructure
How to Mitigate CVE-2025-24306
Immediate Actions Required
- Upgrade affected +F FS010M devices to firmware V2.0.0_1101 or later as published by FSI PlusF
- Rotate all administrative credentials on the router and disable any default or shared accounts
- Restrict access to the management interface to trusted management VLANs or specific source IP addresses
- Audit recent administrative activity and configuration changes for signs of prior exploitation
Patch Information
FSI PlusF released firmware V2.0.0_1101 to address CVE-2025-24306. Patch details and download instructions are published on the FSI PlusF News Update page and referenced in the JVN Security Advisory JVN11230428. Administrators should validate the firmware version after upgrade and confirm that the management interface no longer accepts unsanitized command parameters.
Workarounds
- Disable remote administrative access where the management interface is not required
- Place the router behind an access control list that limits management traffic to authorized administrator workstations
- Enforce strong, unique administrative passwords and enable any available account lockout or multi-factor controls
- Monitor for the release of additional vendor guidance if immediate patching is not feasible
# Example: restrict management interface access at the network edge
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
