CVE-2025-29230
📋 TL;DR
This CVE describes a command injection vulnerability in Linksys E5600 routers that allows attackers to execute arbitrary commands on the device. The vulnerability exists in the runtime.emailReg function and can be triggered via the email parameter. This affects Linksys E5600 router users running vulnerable firmware.
💻 Affected Systems
- Linksys E5600
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent remote access, network traffic interception, lateral movement to connected devices, and router bricking.
Likely Case
Router takeover enabling DNS hijacking, credential theft from network traffic, and installation of persistent backdoors.
If Mitigated
Limited impact if email registration functionality is disabled or network segmentation isolates the router.
🎯 Exploit Status
Exploitation requires access to the email registration functionality; GitHub reference suggests technical details are available but no public exploit code.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Linksys for latest firmware > v1.1.0.26
Vendor Advisory: Not provided in CVE details
Restart Required: Yes
Instructions:
1. Log into Linksys router admin interface. 2. Navigate to Administration > Firmware Upgrade. 3. Check for updates or manually download latest firmware from Linksys support site. 4. Upload and install firmware update. 5. Reboot router after installation.
🔧 Temporary Workarounds
Disable email registration functionality
allIf email registration is not needed, disable this feature to remove attack surface
Network segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Implement strict network access controls to limit who can access router management interface
- Monitor router logs for suspicious email parameter values containing shell metacharacters
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface: Status > Router > Firmware VersionCheck Version:
Not applicable - use web interface or check via SSH if enabledVerify Fix Applied:
Verify firmware version is greater than v1.1.0.26 and test email registration functionality with safe test values📡 Detection & Monitoring
Log Indicators:
- Unusual email parameter values containing shell metacharacters (;, &, |, $, etc.) in router logs
- Unexpected process execution or system command logs
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- DNS queries to suspicious domains from router
SIEM Query:
source="router_logs" AND (email="*;*" OR email="*&*" OR email="*|*" OR email="*`*" OR email="*$(*")