CVE-2025-29269
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary operating system commands on ALLNET ALL-RUT22GW industrial LTE cellular routers via the popen.cgi endpoint. Attackers can gain complete control of affected devices without authentication. Organizations using these routers in industrial, IoT, or network infrastructure deployments are at risk.
💻 Affected Systems
- ALLNET ALL-RUT22GW Industrial LTE Cellular Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to pivot to internal networks, intercept/modify traffic, deploy ransomware, or use devices as botnet nodes for DDoS attacks.
Likely Case
Attackers gain root access to routers, enabling traffic interception, credential theft, network reconnaissance, and persistence for future attacks.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated network segments, though device compromise still occurs.
🎯 Exploit Status
The vulnerability requires no authentication and can be exploited with simple HTTP requests containing command injection payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available at time of analysis
Restart Required: No
Instructions:
1. Monitor ALLNET website for security advisories. 2. Check for firmware updates via router web interface. 3. Apply any available patches immediately.
🔧 Temporary Workarounds
Block popen.cgi endpoint
linuxUse firewall rules or web server configuration to block access to the vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "popen.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "popen.cgi" --algo bm -j DROP
Disable web interface
allDisable the router's web management interface if not required
Check router configuration for web interface disable option
🧯 If You Can't Patch
- Segment routers on isolated VLANs with strict firewall rules limiting inbound/outbound traffic
- Implement network monitoring with IDS/IPS rules to detect command injection attempts
🔍 How to Verify
Check if Vulnerable:
Test by sending HTTP request to http://[router-ip]/popen.cgi?command=id and checking for command output in responseCheck Version:
Check router web interface or use curl -s http://[router-ip]/cgi-bin/version.cgiVerify Fix Applied:
Verify patch by testing same exploit attempt and confirming command execution fails📡 Detection & Monitoring
Log Indicators:
- HTTP requests to popen.cgi with suspicious parameters
- Unusual command execution in system logs
- Multiple failed login attempts followed by popen.cgi access
Network Indicators:
- HTTP requests containing shell metacharacters (;, |, &, $, `)
- Unusual outbound connections from router to unknown IPs
- Traffic patterns suggesting command-and-control communication
SIEM Query:
source="router_logs" AND (url="*popen.cgi*" AND (param="*;*" OR param="*|*" OR param="*&*" OR param="*`*" OR param="*$*"))