CVE-2020-37125 Overview
CVE-2020-37125 is a critical remote code execution (RCE) vulnerability affecting the Edimax EW-7438RPn-v3 Mini Wi-Fi range extender running firmware version 1.27. The vulnerability exists in the /goform/mp endpoint, which fails to properly sanitize user input, allowing unauthenticated attackers to inject and execute arbitrary system commands on the device. This command injection flaw (CWE-78) enables threat actors to remotely compromise vulnerable devices by sending specially crafted POST requests containing malicious payloads.
Critical Impact
Unauthenticated attackers can achieve full remote code execution on affected Edimax devices, potentially allowing them to download and execute malicious scripts, pivot to other network devices, or incorporate the device into a botnet.
Affected Products
- Edimax EW-7438RPn-v3 Mini Wi-Fi Range Extender
- Firmware version 1.27
Discovery Timeline
- 2026-02-05 - CVE-2020-37125 published to NVD
- 2026-02-05 - Last updated in NVD database
Technical Details for CVE-2020-37125
Vulnerability Analysis
This vulnerability is classified as an OS Command Injection flaw (CWE-78). The affected /goform/mp endpoint on the Edimax EW-7438RPn-v3 Mini device accepts POST requests without requiring authentication. User-supplied parameters are passed directly to system shell commands without proper input validation or sanitization, enabling attackers to inject arbitrary commands that execute with the privileges of the web server process.
The network-based attack vector with no authentication requirements makes this vulnerability particularly dangerous for exposed devices. An attacker does not need any special privileges or user interaction to exploit this flaw—simply network access to the target device is sufficient. Successful exploitation results in complete compromise of the device's confidentiality, integrity, and availability.
Root Cause
The root cause of this vulnerability is improper input validation in the /goform/mp endpoint handler. The firmware fails to sanitize or escape special characters in user-supplied input before incorporating them into operating system commands. This allows command injection through shell metacharacters such as semicolons, pipes, or backticks, which can be used to chain additional commands for execution.
Attack Vector
The attack is executed remotely over the network by sending specially crafted HTTP POST requests to the vulnerable /goform/mp endpoint. Attackers can leverage standard command injection techniques to append malicious commands to legitimate parameters. A typical attack scenario involves:
- Identifying an exposed Edimax EW-7438RPn-v3 device on the network
- Crafting a POST request to /goform/mp with command injection payloads
- Injecting commands to download malicious scripts from attacker-controlled servers
- Executing the downloaded payloads to establish persistence or further compromise
The vulnerability allows attackers to download and execute scripts remotely, making it suitable for botnet recruitment or as an initial access point for lateral movement within a network. For detailed technical analysis and proof-of-concept information, refer to the Exploit-DB #48318 entry and the VulnCheck Edimax Advisory.
Detection Methods for CVE-2020-37125
Indicators of Compromise
- Unexpected HTTP POST requests to /goform/mp endpoint containing shell metacharacters (;, |, $(), backticks)
- Outbound connections from the device to unknown external IP addresses or domains
- Presence of unfamiliar processes or scripts running on the device
- Unusual network traffic patterns originating from the range extender
Detection Strategies
- Monitor network traffic for POST requests to /goform/mp containing suspicious payloads or encoded command sequences
- Implement intrusion detection system (IDS) rules to alert on command injection patterns targeting Edimax devices
- Conduct regular firmware version audits to identify devices running vulnerable firmware version 1.27
- Review web server logs on the device for anomalous request patterns
Monitoring Recommendations
- Deploy network-level monitoring to detect exploitation attempts targeting IoT devices
- Implement network segmentation to isolate IoT devices from critical infrastructure
- Configure alerting for any outbound connections from Wi-Fi range extenders to external hosts
- Periodically scan for exposed Edimax devices using network discovery tools
How to Mitigate CVE-2020-37125
Immediate Actions Required
- Isolate affected Edimax EW-7438RPn-v3 devices from untrusted networks immediately
- Block external access to the device's web management interface via firewall rules
- Monitor network traffic from the device for signs of compromise
- Consider replacing the device if no firmware update is available from the vendor
Patch Information
Check the Edimax Product Page for any available firmware updates that address this vulnerability. If a patched firmware version is available, apply it immediately following the vendor's update instructions.
Workarounds
- Restrict network access to the device's management interface to trusted IP addresses only
- Place the device on an isolated network segment with no direct internet access
- Disable remote management features if not required for operations
- Implement strict firewall rules to block inbound connections to the device from untrusted sources
# Example firewall rule to restrict access to device management interface
# Replace 192.168.1.100 with your Edimax device IP and 10.0.0.0/24 with trusted management subnet
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -d 192.168.1.100 -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.