CVE-2025-9583: Comfast CF-N1 Firmware RCE Vulnerability

CVE-2025-9583 Overview

CVE-2025-9583 is a command injection vulnerability in Comfast CF-N1 wireless access point firmware version 2.6.0. The flaw resides in the ping_config function within the /usr/bin/webmgnt binary, which handles web management requests. Attackers can manipulate input passed to this function to inject arbitrary operating system commands. Remote exploitation is feasible over the network, and the exploit has been publicly disclosed. The vulnerability is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component). Successful exploitation grants attackers the ability to execute commands on the device with the privileges of the web management process.

Critical Impact
Authenticated remote attackers can inject operating system commands through the ping_config handler in /usr/bin/webmgnt, leading to unauthorized command execution on affected Comfast CF-N1 devices.

Affected Products

Comfast CF-N1 hardware revision 2
Comfast CF-N1 firmware version 2.6.0
Devices running the /usr/bin/webmgnt management binary with the vulnerable ping_config function

Discovery Timeline

2025-08-28 - CVE-2025-9583 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-9583

Vulnerability Analysis

The vulnerability exists in the ping_config function inside the /usr/bin/webmgnt binary on Comfast CF-N1 devices. This function processes ping diagnostic requests submitted through the device's web management interface. User-supplied input is passed to a shell or command interpreter without proper neutralization of metacharacters. Attackers craft requests containing shell metacharacters such as semicolons, backticks, or pipes to chain arbitrary commands onto the legitimate ping invocation. The injected commands execute in the context of the web management process on the embedded Linux system. According to the EPSS model, this issue ranks in the 91st percentile for likelihood of exploitation activity, despite a low base score.

Root Cause

The root cause is improper input neutralization [CWE-74] in the ping_config handler. The function constructs a command string using attacker-controlled parameters and passes it to a system shell without sanitization or argument separation. Embedded networking devices often invoke utilities like ping through system() or popen() calls, which interpret shell metacharacters and enable command chaining when input is not properly escaped.

Attack Vector

Exploitation requires network reachability to the device's web management interface and a valid low-privilege session. An attacker sends a crafted HTTP request to the endpoint that invokes ping_config, embedding shell metacharacters in the host or parameter field intended for the ping target. The vulnerable code passes the tainted value to the shell, executing the appended commands. Public disclosure details and proof-of-concept material are referenced through the GitHub Configuration Repository and VulDB entry #321696.

Detection Methods for CVE-2025-9583

Indicators of Compromise

Unexpected outbound connections originating from the CF-N1 device to attacker-controlled infrastructure
HTTP requests to the device's web management interface containing shell metacharacters such as ;, |, &&, `, or $() in ping-related parameters
New or modified files in writable areas of the device filesystem following web management activity
Unexpected child processes spawned by /usr/bin/webmgnt

Detection Strategies

Inspect web server and management interface logs for ping_config requests containing shell metacharacters or URL-encoded equivalents
Monitor network traffic between management workstations and CF-N1 devices for anomalous POST bodies and oversized parameter values
Correlate authentication events with subsequent diagnostic requests to identify low-privilege accounts probing the ping interface

Monitoring Recommendations

Place CF-N1 devices behind network segmentation that restricts access to the management interface to a defined administrative subnet
Forward syslog and authentication events from the device to a central logging platform for retention and alerting
Baseline normal management traffic patterns and alert on deviations such as new source IPs, unusual user agents, or repeated ping_config invocations

How to Mitigate CVE-2025-9583

Immediate Actions Required

Restrict access to the CF-N1 web management interface to trusted management networks only, blocking exposure to untrusted or internet-facing segments
Rotate all administrative credentials on affected devices and remove any unused or default low-privilege accounts
Audit recent web management logs for suspicious ping_config requests and investigate any anomalies
Inventory all Comfast CF-N1 devices in the environment and confirm firmware version 2.6.0 status

Patch Information

At the time of NVD publication, no vendor patch or fixed firmware release is referenced in the advisory. Administrators should monitor the Comfast vendor channels and the VulDB advisory for updated firmware. Until a fixed release is available, apply the workarounds below.

Workarounds

Disable the web management interface entirely if device administration can be performed through alternative means
Apply firewall ACLs that permit access to the management TCP ports only from specified administrator IP addresses
Place the device on an isolated VLAN with no route to sensitive internal resources to limit blast radius if exploited
Consider replacement of unsupported or end-of-life hardware where vendor patching is unlikely

bash

# Example firewall restriction limiting management access to a trusted subnet
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP