CVE-2025-45487
📋 TL;DR
This CVE describes a command injection vulnerability in the Linksys E5600 router's runtime.InternetConnection function. Attackers can execute arbitrary commands with root privileges by injecting malicious input. All users running the affected firmware version are vulnerable.
💻 Affected Systems
- Linksys E5600
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent backdoor installation, credential theft, network pivoting, and participation in botnets.
Likely Case
Router takeover leading to DNS hijacking, traffic interception, credential harvesting, and lateral movement into connected devices.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Proof-of-concept code is publicly available, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Linksys support for firmware updates. 2. Download latest firmware from official site. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external attackers from accessing the vulnerable interface
Access router admin > Administration > Remote Management > Disable
Network Segmentation
allIsolate router management interface from general network
🧯 If You Can't Patch
- Replace affected device with a supported model
- Implement strict network firewall rules to block all inbound traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under Administration > Firmware UpgradeCheck Version:
curl -s http://router-ip/status.cgi | grep firmwareVerify Fix Applied:
Verify firmware version is no longer v1.1.0.26 and test if exploit PoC no longer works📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed authentication attempts to admin interface
- Suspicious process creation
Network Indicators:
- Unexpected outbound connections from router
- DNS queries to malicious domains
- Port scanning originating from router
SIEM Query:
source="router-logs" AND ("runtime.InternetConnection" OR "command injection" OR suspicious shell commands)