CVE-2025-26412
📋 TL;DR
The SIMCom SIM7600G modem contains an undocumented AT command that allows execution of arbitrary system commands with root privileges. This affects any device using this modem where an attacker has physical access or remote shell access to the host system. The vulnerability enables complete compromise of the modem's functionality.
💻 Affected Systems
- SIMCom SIM7600G modem
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete takeover of modem functionality, enabling interception/modification of all communications, persistent backdoor installation, and potential lateral movement to connected systems.
Likely Case
Unauthorized access to modem configuration, data interception, denial of service, or installation of malicious firmware.
If Mitigated
Limited impact if proper access controls prevent unauthorized AT command execution and network segmentation isolates modem traffic.
🎯 Exploit Status
Exploitation requires ability to send AT commands to the modem, either through physical access or via compromised host system.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check with SIMCom for specific firmware version
Vendor Advisory: https://r.sec-consult.com/simcom
Restart Required: Yes
Instructions:
1. Contact SIMCom for updated firmware. 2. Backup current configuration. 3. Flash updated firmware via appropriate interface. 4. Restart modem. 5. Verify fix by testing undocumented command.
🔧 Temporary Workarounds
Restrict AT Command Access
allLimit which systems/users can send AT commands to the modem interface
# Use firewall rules to restrict access to modem serial/USB interface
# Implement access controls on host system to limit who can interact with modem
Network Segmentation
allIsolate modem communication to dedicated network segment
# Configure VLANs to separate modem traffic
# Implement strict firewall rules between modem network and other networks
🧯 If You Can't Patch
- Implement strict physical security controls to prevent unauthorized access to devices containing the modem
- Monitor and log all AT command activity to the modem for suspicious patterns
🔍 How to Verify
Check if Vulnerable:
Send the undocumented AT command to the modem and check if system commands execute. Exact command should be obtained from security advisory.Check Version:
AT+CGMR (check modem firmware version) or vendor-specific version commandVerify Fix Applied:
After patching, attempt to execute the undocumented AT command - it should return an error or be removed.📡 Detection & Monitoring
Log Indicators:
- Unusual AT command sequences
- Unexpected system command execution on modem
- Modem configuration changes without authorization
Network Indicators:
- Unusual traffic patterns from modem
- Unexpected connections originating from modem
SIEM Query:
search 'AT command' OR 'modem' AND (exec OR system OR root) in device logs